diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3c853b81..a5c62bce 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,7 +19,7 @@ jobs:
     strategy:
       max-parallel: 3
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: [3.7, 3.8, 3.9]
     steps:
       - uses: actions/checkout@v2
 
diff --git a/.isort.cfg b/.isort.cfg
new file mode 100644
index 00000000..aa7e7666
--- /dev/null
+++ b/.isort.cfg
@@ -0,0 +1,3 @@
+[tool.isort]
+profile = "black"
+multi_line_output = 3
diff --git a/README.md b/README.md
index 52e213d5..a001b406 100644
--- a/README.md
+++ b/README.md
@@ -20,12 +20,24 @@ Norfair is built, used and maintained by [Tryolabs](https://tryolabs.com).
 
 ## Installation
 
-Norfair currently supports Python 3.6+.
+Norfair currently supports Python 3.7+.
+
+For the pure Python version, install as:
 
 ```bash
 pip install norfair
 ```
 
+To make Norfair install the dependencies to support more features, install as:
+
+```bash
+pip install norfair[video]  # Adds several video helper features running on OpenCV
+pip install norfair[metrics]  # Supports running MOT metrics evaluation
+pip install norfair[metrics,video]  # Everything included
+```
+
+If the needed dependencies are already present in the system, installing the pure Python version of Norfair is enough for enabling the extra features. This is particuarly useful for embedded devices, where installing compiled dependencies can be difficult.
+
 ## How it works
 
 Norfair works by estimating the future position of each point based on its past positions. It then tries to match these estimated positions with newly detected points provided by the detector. For this matching to occur, Norfair can rely on any distance function specified by the user of the library. Therefore, each object tracker can be made as simple or as complex as needed.
@@ -114,4 +126,4 @@ If you are interested, please [contact us](https://tryolabs.com/#contact).
 
 ## License
 
-Copyright © 2020, [Tryolabs](https://tryolabs.com). Released under the [BSD 3-Clause](LICENSE).
+Copyright © 2021, [Tryolabs](https://tryolabs.com). Released under the [BSD 3-Clause](LICENSE).
diff --git a/demos/alphapose/README.md b/demos/alphapose/README.md
index fc2439a7..f019d3e5 100644
--- a/demos/alphapose/README.md
+++ b/demos/alphapose/README.md
@@ -4,8 +4,9 @@ An example of how to integrate Norfair into the video inference loop of a pre ex
 
 ## Instructions
 
-1. [Follow the instructions](https://github.com/MVIG-SJTU/AlphaPose/tree/pytorch#installation) to install the Pytorch version of AlphaPose.
-2. Apply this diff to this [commit](https://github.com/MVIG-SJTU/AlphaPose/commit/ded84d450faf56227680f0527ff7e24ab7268754) on AlphaPose and use their [video_demo.py](https://github.com/MVIG-SJTU/AlphaPose/blob/ded84d450faf56227680f0527ff7e24ab7268754/video_demo.py) to process your video.
+1. Install Norfair with `pip install norfair[video]`.
+2. [Follow the instructions](https://github.com/MVIG-SJTU/AlphaPose/tree/pytorch#installation) to install the Pytorch version of AlphaPose.
+3. Apply this diff to this [commit](https://github.com/MVIG-SJTU/AlphaPose/commit/ded84d450faf56227680f0527ff7e24ab7268754) on AlphaPose and use their [video_demo.py](https://github.com/MVIG-SJTU/AlphaPose/blob/ded84d450faf56227680f0527ff7e24ab7268754/video_demo.py) to process your video.
 
     ```diff
     diff --git a/dataloader.py b/dataloader.py
diff --git a/demos/detectron2/README.md b/demos/detectron2/README.md
index 026bace4..46a97e43 100644
--- a/demos/detectron2/README.md
+++ b/demos/detectron2/README.md
@@ -6,8 +6,9 @@ Simplest possible example of tracking. Based on [Detectron2](https://github.com/
 
 Assuming Norfair is installed:
 
-1. [Follow the instructions](https://detectron2.readthedocs.io/tutorials/install.html) to install Detectron2.
-2. Run `python detectron2_cars.py`. For the demo, we are using [this traffic footage](https://www.youtube.com/watch?v=aio9g9_xVio).
+1. Install Norfair with `pip install norfair[video]`.
+2. [Follow the instructions](https://detectron2.readthedocs.io/tutorials/install.html) to install Detectron2.
+3. Run `python detectron2_cars.py`. For the demo, we are using [this traffic footage](https://www.youtube.com/watch?v=aio9g9_xVio).
 
 ## Explanation
 
diff --git a/demos/motmetrics4norfair/README.md b/demos/motmetrics4norfair/README.md
index 814defcc..a2066597 100644
--- a/demos/motmetrics4norfair/README.md
+++ b/demos/motmetrics4norfair/README.md
@@ -1,24 +1,28 @@
 # Compute MOTChallenge metrics
+
 Demo on how to evaluate a Norfair tracker on the [MOTChallenge](https://motchallenge.net).
 
 ## Instructions
 
-1. Download the [MOT17](https://motchallenge.net/data/MOT17/) dataset running
+1. Install Norfair with `pip install norfair[metrics,video]`.
+2. Download the [MOT17](https://motchallenge.net/data/MOT17/) dataset running:
+
+    ```bash
+    curl -O https://motchallenge.net/data/MOT17.zip  # To download Detections + Ground Truth + Images (5.5GB)
+    unzip MOT17.zip
+    ```
+
+    or
 
-```bash
-curl -O https://motchallenge.net/data/MOT17.zip  # To download Detections + Ground Truth + Images (5.5GB)  
-unzip MOT17.zip
- ``` 
-or
+    ```bash
+    curl -O https://motchallenge.net/data/MOT17Labels.zip  # To download Detections + Ground Truth (9.7 MB)
+    unzip MOT17Labels.zip
+    ```
 
-```bash
-curl -O https://motchallenge.net/data/MOT17Labels.zip  # To download Detections + Ground Truth (9.7 MB)  
-unzip MOT17Labels.zip
-``` 
+    Given that the ground truth files for the testing set are not publicly available, you will only be able to use motmetrics4norfair with the training set.
 
-Given that the ground truth files for the testing set are not publicly available, you will only be able to use motmetrics4norfair with the training set.
+3. Display the instructions:
 
-2. Display the motmetrics4norfair instructions: 
-```bash
-    python motmetrics4norfair.py --help 
-``` 
\ No newline at end of file
+    ```bash
+    python motmetrics4norfair.py --help
+    ```
diff --git a/demos/motmetrics4norfair/motmetrics4norfair.py b/demos/motmetrics4norfair/motmetrics4norfair.py
index 1c0bcd0b..40dabaac 100644
--- a/demos/motmetrics4norfair/motmetrics4norfair.py
+++ b/demos/motmetrics4norfair/motmetrics4norfair.py
@@ -1,8 +1,9 @@
+import argparse
 import os.path
+
 import numpy as np
-import norfair
-from norfair import Detection, Tracker, metrics, video, drawing
-import argparse
+
+from norfair import Tracker, drawing, metrics, video
 
 frame_skip_period = 1
 detection_threshold = 0.01
diff --git a/demos/openpose/README.md b/demos/openpose/README.md
index 51ff7be7..2439c7a5 100644
--- a/demos/openpose/README.md
+++ b/demos/openpose/README.md
@@ -4,8 +4,9 @@ Demo for extrapolating detections through skipped frames. Based on [OpenPose](ht
 
 ## Instructions
 
-1. Install [OpenPose version 1.4](https://github.com/CMU-Perceptual-Computing-Lab/openpose/releases/tag/v1.4.0).
-2. Run `python openpose_extrapolation.py`.
+1. Install Norfair with `pip install norfair[video]`.
+2. Install [OpenPose version 1.4](https://github.com/CMU-Perceptual-Computing-Lab/openpose/releases/tag/v1.4.0).
+3. Run `python openpose_extrapolation.py`.
 
 ## Explanation
 
diff --git a/demos/yolov4/README.md b/demos/yolov4/README.md
index cbcd7e61..5c1969f4 100644
--- a/demos/yolov4/README.md
+++ b/demos/yolov4/README.md
@@ -4,12 +4,12 @@ Simplest possible example of tracking. Based on [pytorch YOLOv4](https://github.
 
 ## Instructions
 
-1. Clone [pytorch YOLOv4](https://github.com/Tianxiaomo/pytorch-YOLOv4/tree/master) and download the [weights](https://drive.google.com/open?id=1wv_LiFeCRYwtpkqREPeI13-gPELBDwuJ) published on the repo into your local clone of the repo.
-2. Copy `yolov4demo.py` into your local clone of the repo and run `python yolov4demo.py <video file>`.
+1. Install Norfair with `pip install norfair[video]`.
+2. Clone [pytorch YOLOv4](https://github.com/Tianxiaomo/pytorch-YOLOv4/tree/master) and download the [weights](https://drive.google.com/open?id=1wv_LiFeCRYwtpkqREPeI13-gPELBDwuJ) published on the repo into your local clone of the repo.
+3. Copy `yolov4demo.py` into your local clone of the repo and run `python yolov4demo.py <video file>`.
 
 ## Explanation
 
 This example tracks objects using a single point per detection: the centroid of the bounding boxes around cars returned by YOLOv4.
 
 ![Norfair YOLOv4 demo](../../docs/yolo_cars.gif)
-
diff --git a/demos/yolov4/yolov4demo.py b/demos/yolov4/yolov4demo.py
index fc99de85..39f40a5d 100644
--- a/demos/yolov4/yolov4demo.py
+++ b/demos/yolov4/yolov4demo.py
@@ -3,13 +3,13 @@
 import cv2
 import numpy as np
 import torch
-
-import norfair
 from models import Yolov4
-from norfair import Detection, Tracker, Video
 from tool.torch_utils import do_detect
 from tool.utils import load_class_names, plot_boxes_cv2
 
+import norfair
+from norfair import Detection, Tracker, Video
+
 max_distance_between_points = 30
 
 
diff --git a/norfair/__init__.py b/norfair/__init__.py
index 768a02ff..5f7c4a4b 100644
--- a/norfair/__init__.py
+++ b/norfair/__init__.py
@@ -1,4 +1,4 @@
 from .drawing import *
 from .tracker import Detection, Tracker
-from .utils import print_objects_as_table, get_cutout
+from .utils import get_cutout, print_objects_as_table
 from .video import Video
diff --git a/norfair/drawing.py b/norfair/drawing.py
index 5bdf1caa..3e71d13f 100644
--- a/norfair/drawing.py
+++ b/norfair/drawing.py
@@ -1,10 +1,15 @@
-from typing import Optional, Tuple, Sequence
+from typing import Optional, Sequence, Tuple
 
-import cv2
-import numpy as np
+try:
+    import cv2
+except ImportError:
+    from .utils import DummyOpenCVImport
+
+    cv2 = DummyOpenCVImport()
 import random
 
-from .tracker import Detection, TrackedObject
+import numpy as np
+
 from .utils import validate_points
 
 
diff --git a/norfair/metrics.py b/norfair/metrics.py
index 05fb37e8..0b0f7dd8 100644
--- a/norfair/metrics.py
+++ b/norfair/metrics.py
@@ -1,11 +1,21 @@
 import os
+
 import numpy as np
 from rich import print
 from rich.progress import track
+
 from norfair import Detection
-import motmetrics as mm
+
+try:
+    import motmetrics as mm
+    import pandas as pd
+except ImportError:
+    from .utils import DummyMOTMetricsImport
+
+    mm = DummyMOTMetricsImport()
+    pandas = DummyMOTMetricsImport()
 from collections import OrderedDict
-import pandas as pd
+
 
 
 class InformationFile:
@@ -157,6 +167,9 @@ def __init__(self):
         self.paths = []
 
     def create_accumulator(self, input_path, information_file=None):
+        # Check that motmetrics is installed here, so we don't have to process
+        # the whole dataset before failing out if we don't.
+        mm.metrics
 
         file_name = os.path.split(input_path)[1]
 
@@ -220,9 +233,9 @@ def compute_metrics(
         return self.summary
 
     def save_metrics(self, save_path=".", file_name="metrics.txt"):
-
         if not os.path.exists(save_path):
-            os.makedirs(save_folder)
+            os.makedirs(save_path)
+
         metrics_path = os.path.join(save_path, file_name)
         metrics_file = open(metrics_path, "w+")
         metrics_file.write(self.summary)
diff --git a/norfair/tracker.py b/norfair/tracker.py
index 90490ac4..4dd9206e 100644
--- a/norfair/tracker.py
+++ b/norfair/tracker.py
@@ -1,10 +1,10 @@
 import math
-from typing import Callable, Optional, Sequence, List
+from typing import Callable, List, Optional, Sequence
 
 import numpy as np
 from filterpy.kalman import KalmanFilter
-
 from rich import print
+
 from .utils import validate_points
 
 
diff --git a/norfair/utils.py b/norfair/utils.py
index 49a3a0dd..cae724d9 100644
--- a/norfair/utils.py
+++ b/norfair/utils.py
@@ -1,5 +1,5 @@
 import os
-from typing import Tuple, Sequence
+from typing import Sequence, Tuple
 
 import numpy as np
 from rich import print
@@ -68,3 +68,23 @@ def get_cutout(points, image):
     max_y = int(max(points[:, 1]))
     min_y = int(min(points[:, 1]))
     return image[min_y:max_y, min_x:max_x]
+
+
+class DummyOpenCVImport:
+    def __getattribute__(self, name):
+        print(
+            """[bold red]Missing dependency:[/bold red] You are trying to use Norfair's video features. However, OpenCV is not installed.
+
+Please, make sure there is an existing installation of OpenCV or install Norfair with `pip install norfair\[video]`."""
+        )
+        exit()
+
+
+class DummyMOTMetricsImport:
+    def __getattribute__(self, name):
+        print(
+            """[bold red]Missing dependency:[/bold red] You are trying to use Norfair's metrics features without the required dependencies.
+
+Please, install Norfair with `pip install norfair\[metrics]`, or `pip install norfair\[metrics,video]` if you also want video features."""
+        )
+        exit()
diff --git a/norfair/video.py b/norfair/video.py
index c4aa3bde..5d8e7930 100644
--- a/norfair/video.py
+++ b/norfair/video.py
@@ -1,11 +1,16 @@
 import os
 import time
-from typing import Optional, List, Union
+from typing import List, Optional, Union
 
-import cv2
+try:
+    import cv2
+except ImportError:
+    from .utils import DummyOpenCVImport
+
+    cv2 = DummyOpenCVImport()
 import numpy as np
 from rich import print
-from rich.progress import BarColumn, Progress, TimeRemainingColumn, ProgressColumn
+from rich.progress import BarColumn, Progress, ProgressColumn, TimeRemainingColumn
 
 from .utils import get_terminal_size
 
diff --git a/poetry.lock b/poetry.lock
index c72d0e67..5a9dc18d 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,121 +1,130 @@
 [[package]]
-category = "dev"
-description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
 name = "appdirs"
+version = "1.4.4"
+description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
+category = "dev"
 optional = false
 python-versions = "*"
-version = "1.4.4"
 
 [[package]]
-category = "dev"
-description = "An abstract syntax tree for Python with inference support."
 name = "astroid"
+version = "2.4.2"
+description = "An abstract syntax tree for Python with inference support."
+category = "dev"
 optional = false
 python-versions = ">=3.5"
-version = "2.4.2"
 
 [package.dependencies]
 lazy-object-proxy = ">=1.4.0,<1.5.0"
 six = ">=1.12,<2.0"
+typed-ast = {version = ">=1.4.0,<1.5", markers = "implementation_name == \"cpython\" and python_version < \"3.8\""}
 wrapt = ">=1.11,<2.0"
 
-[package.dependencies.typed-ast]
-python = "<3.8"
-version = ">=1.4.0,<1.5"
-
 [[package]]
-category = "main"
-description = "Atomic file writes."
-marker = "sys_platform == \"win32\""
 name = "atomicwrites"
+version = "1.4.0"
+description = "Atomic file writes."
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "1.4.0"
 
 [[package]]
-category = "main"
-description = "Classes Without Boilerplate"
 name = "attrs"
+version = "20.3.0"
+description = "Classes Without Boilerplate"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "20.2.0"
 
 [package.extras]
-dev = ["coverage (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "sphinx", "sphinx-rtd-theme", "pre-commit"]
-docs = ["sphinx", "sphinx-rtd-theme", "zope.interface"]
-tests = ["coverage (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
-tests_no_zope = ["coverage (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six"]
+dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "furo", "sphinx", "pre-commit"]
+docs = ["furo", "sphinx", "zope.interface"]
+tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
+tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six"]
 
 [[package]]
-category = "main"
-description = "Python package for providing Mozilla's CA Bundle."
-name = "certifi"
+name = "black"
+version = "20.8b1"
+description = "The uncompromising code formatter."
+category = "dev"
 optional = false
-python-versions = "*"
-version = "2020.6.20"
+python-versions = ">=3.6"
+
+[package.dependencies]
+appdirs = "*"
+click = ">=7.1.2"
+mypy-extensions = ">=0.4.3"
+pathspec = ">=0.6,<1"
+regex = ">=2020.1.8"
+toml = ">=0.10.1"
+typed-ast = ">=1.4.0"
+typing-extensions = ">=3.7.4"
+
+[package.extras]
+colorama = ["colorama (>=0.4.3)"]
+d = ["aiohttp (>=3.3.2)", "aiohttp-cors"]
 
 [[package]]
-category = "main"
-description = "Cross-platform colored terminal text."
-name = "colorama"
+name = "click"
+version = "7.1.2"
+description = "Composable command line interface toolkit"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "0.4.3"
 
 [[package]]
+name = "colorama"
+version = "0.4.4"
+description = "Cross-platform colored terminal text."
 category = "main"
-description = "Python parser for the CommonMark Markdown spec"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[[package]]
 name = "commonmark"
+version = "0.9.1"
+description = "Python parser for the CommonMark Markdown spec"
+category = "main"
 optional = false
 python-versions = "*"
-version = "0.9.1"
 
 [package.extras]
-test = ["flake8 (3.7.8)", "hypothesis (3.55.3)"]
+test = ["flake8 (==3.7.8)", "hypothesis (==3.55.3)"]
 
 [[package]]
-category = "main"
-description = "Composable style cycles"
 name = "cycler"
+version = "0.10.0"
+description = "Composable style cycles"
+category = "main"
 optional = false
 python-versions = "*"
-version = "0.10.0"
 
 [package.dependencies]
 six = "*"
 
 [[package]]
-category = "main"
-description = "A backport of the dataclasses module for Python 3.6"
-marker = "python_version >= \"3.6\" and python_version < \"3.7\""
-name = "dataclasses"
-optional = false
-python-versions = ">=3.6, <3.7"
-version = "0.7"
-
-[[package]]
-category = "dev"
-description = "Distribution utilities"
 name = "distlib"
+version = "0.3.1"
+description = "Distribution utilities"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.3.1"
 
 [[package]]
-category = "dev"
-description = "A platform independent file lock."
 name = "filelock"
+version = "3.0.12"
+description = "A platform independent file lock."
+category = "dev"
 optional = false
 python-versions = "*"
-version = "3.0.12"
 
 [[package]]
-category = "main"
-description = "Kalman filtering and optimal estimation library"
 name = "filterpy"
+version = "1.4.5"
+description = "Kalman filtering and optimal estimation library"
+category = "main"
 optional = false
 python-versions = "*"
-version = "1.4.5"
 
 [package.dependencies]
 matplotlib = "*"
@@ -123,114 +132,92 @@ numpy = "*"
 scipy = "*"
 
 [[package]]
-category = "main"
-description = "the modular source code checker: pep8 pyflakes and co"
 name = "flake8"
-optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
 version = "3.8.4"
+description = "the modular source code checker: pep8 pyflakes and co"
+category = "main"
+optional = true
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
 
 [package.dependencies]
+importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 mccabe = ">=0.6.0,<0.7.0"
 pycodestyle = ">=2.6.0a1,<2.7.0"
 pyflakes = ">=2.2.0,<2.3.0"
 
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = "*"
-
 [[package]]
-category = "main"
-description = "Flake8 and pylama plugin that checks the ordering of import statements."
 name = "flake8-import-order"
-optional = false
-python-versions = "*"
 version = "0.18.1"
+description = "Flake8 and pylama plugin that checks the ordering of import statements."
+category = "main"
+optional = true
+python-versions = "*"
 
 [package.dependencies]
 pycodestyle = "*"
-setuptools = "*"
 
 [[package]]
-category = "main"
-description = "Read metadata from Python packages"
-marker = "python_version < \"3.8\""
 name = "importlib-metadata"
+version = "3.4.0"
+description = "Read metadata from Python packages"
+category = "main"
 optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-version = "1.7.0"
+python-versions = ">=3.6"
 
 [package.dependencies]
+typing-extensions = {version = ">=3.6.4", markers = "python_version < \"3.8\""}
 zipp = ">=0.5"
 
 [package.extras]
-docs = ["sphinx", "rst.linker"]
-testing = ["packaging", "pep517", "importlib-resources (>=1.3)"]
+docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
+testing = ["pytest (>=3.5,!=3.7.3)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pytest-cov", "pytest-enabler", "packaging", "pep517", "pyfakefs", "flufl.flake8", "pytest-black (>=0.3.7)", "pytest-mypy", "importlib-resources (>=1.3)"]
 
 [[package]]
-category = "dev"
-description = "Read resources from Python packages"
-marker = "python_version < \"3.7\""
-name = "importlib-resources"
-optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-version = "3.0.0"
-
-[package.dependencies]
-[package.dependencies.zipp]
-python = "<3.8"
-version = ">=0.4"
-
-[package.extras]
-docs = ["sphinx", "rst.linker", "jaraco.packaging"]
-
-[[package]]
-category = "main"
-description = "iniconfig: brain-dead simple config-ini parsing"
 name = "iniconfig"
+version = "1.1.1"
+description = "iniconfig: brain-dead simple config-ini parsing"
+category = "main"
 optional = false
 python-versions = "*"
-version = "1.0.1"
 
 [[package]]
-category = "dev"
-description = "A Python utility / library to sort Python imports."
 name = "isort"
+version = "5.7.0"
+description = "A Python utility / library to sort Python imports."
+category = "dev"
 optional = false
 python-versions = ">=3.6,<4.0"
-version = "5.5.1"
 
 [package.extras]
-colors = ["colorama (>=0.4.3,<0.5.0)"]
 pipfile_deprecated_finder = ["pipreqs", "requirementslib"]
 requirements_deprecated_finder = ["pipreqs", "pip-api"]
+colors = ["colorama (>=0.4.3,<0.5.0)"]
 
 [[package]]
-category = "main"
-description = "A fast implementation of the Cassowary constraint solver"
 name = "kiwisolver"
+version = "1.3.1"
+description = "A fast implementation of the Cassowary constraint solver"
+category = "main"
 optional = false
 python-versions = ">=3.6"
-version = "1.2.0"
 
 [[package]]
-category = "dev"
-description = "A fast and thorough lazy object proxy."
 name = "lazy-object-proxy"
+version = "1.4.3"
+description = "A fast and thorough lazy object proxy."
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "1.4.3"
 
 [[package]]
-category = "main"
-description = "Python plotting package"
 name = "matplotlib"
+version = "3.3.4"
+description = "Python plotting package"
+category = "main"
 optional = false
 python-versions = ">=3.6"
-version = "3.3.1"
 
 [package.dependencies]
-certifi = ">=2020.06.20"
 cycler = ">=0.10"
 kiwisolver = ">=1.0.1"
 numpy = ">=1.15"
@@ -239,28 +226,20 @@ pyparsing = ">=2.0.3,<2.0.4 || >2.0.4,<2.1.2 || >2.1.2,<2.1.6 || >2.1.6"
 python-dateutil = ">=2.1"
 
 [[package]]
-category = "main"
-description = "McCabe checker, plugin for flake8"
 name = "mccabe"
-optional = false
-python-versions = "*"
 version = "0.6.1"
-
-[[package]]
+description = "McCabe checker, plugin for flake8"
 category = "main"
-description = "More routines for operating on iterables, beyond itertools"
-name = "more-itertools"
 optional = false
-python-versions = ">=3.5"
-version = "8.5.0"
+python-versions = "*"
 
 [[package]]
-category = "main"
-description = "Metrics for multiple object tracker benchmarking."
 name = "motmetrics"
-optional = false
-python-versions = "*"
 version = "1.2.0"
+description = "Metrics for multiple object tracker benchmarking."
+category = "main"
+optional = true
+python-versions = "*"
 
 [package.dependencies]
 flake8 = "*"
@@ -273,173 +252,181 @@ scipy = ">=0.19.0"
 xmltodict = ">=0.12.0"
 
 [[package]]
-category = "main"
-description = "NumPy is the fundamental package for array computing with Python."
-name = "numpy"
+name = "mypy-extensions"
+version = "0.4.3"
+description = "Experimental type system extensions for programs checked with the mypy typechecker."
+category = "dev"
 optional = false
-python-versions = ">=3.6"
-version = "1.19.1"
+python-versions = "*"
 
 [[package]]
+name = "numpy"
+version = "1.20.1"
+description = "NumPy is the fundamental package for array computing with Python."
 category = "main"
-description = "Wrapper package for OpenCV python bindings."
-name = "opencv-python"
 optional = false
-python-versions = ">=3.5"
-version = "4.4.0.42"
+python-versions = ">=3.7"
+
+[[package]]
+name = "opencv-python"
+version = "4.5.1.48"
+description = "Wrapper package for OpenCV python bindings."
+category = "main"
+optional = true
+python-versions = ">=3.6"
 
 [package.dependencies]
-numpy = ">=1.13.1"
+numpy = ">=1.17.3"
 
 [[package]]
-category = "main"
-description = "Core utilities for Python packages"
 name = "packaging"
+version = "20.9"
+description = "Core utilities for Python packages"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "20.4"
 
 [package.dependencies]
 pyparsing = ">=2.0.2"
-six = "*"
 
 [[package]]
-category = "main"
-description = "Powerful data structures for data analysis, time series, and statistics"
 name = "pandas"
-optional = false
-python-versions = ">=3.5.3"
-version = "0.25.3"
+version = "1.1.5"
+description = "Powerful data structures for data analysis, time series, and statistics"
+category = "main"
+optional = true
+python-versions = ">=3.6.1"
 
 [package.dependencies]
-numpy = ">=1.13.3"
-python-dateutil = ">=2.6.1"
+numpy = ">=1.15.4"
+python-dateutil = ">=2.7.3"
 pytz = ">=2017.2"
 
 [package.extras]
 test = ["pytest (>=4.0.2)", "pytest-xdist", "hypothesis (>=3.58)"]
 
 [[package]]
-category = "main"
-description = "Python Imaging Library (Fork)"
-name = "pillow"
+name = "pathspec"
+version = "0.8.1"
+description = "Utility library for gitignore style pattern matching of file paths."
+category = "dev"
 optional = false
-python-versions = ">=3.5"
-version = "7.2.0"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
+name = "pillow"
+version = "8.1.0"
+description = "Python Imaging Library (Fork)"
 category = "main"
-description = "plugin and hook calling mechanisms for python"
+optional = false
+python-versions = ">=3.6"
+
+[[package]]
 name = "pluggy"
+version = "0.13.1"
+description = "plugin and hook calling mechanisms for python"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "0.13.1"
 
 [package.dependencies]
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = ">=0.12"
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 
 [package.extras]
 dev = ["pre-commit", "tox"]
 
 [[package]]
-category = "main"
-description = "library with cross-python path, ini-parsing, io, code, log facilities"
 name = "py"
+version = "1.10.0"
+description = "library with cross-python path, ini-parsing, io, code, log facilities"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "1.9.0"
 
 [[package]]
-category = "main"
-description = "Get CPU info with pure Python 2 & 3"
 name = "py-cpuinfo"
-optional = false
-python-versions = "*"
 version = "7.0.0"
+description = "Get CPU info with pure Python 2 & 3"
+category = "main"
+optional = true
+python-versions = "*"
 
 [[package]]
-category = "main"
-description = "Python style guide checker"
 name = "pycodestyle"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "2.6.0"
+description = "Python style guide checker"
+category = "main"
+optional = true
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
-category = "main"
-description = "passive checker of Python programs"
 name = "pyflakes"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "2.2.0"
+description = "passive checker of Python programs"
+category = "main"
+optional = true
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
-category = "main"
-description = "Pygments is a syntax highlighting package written in Python."
 name = "pygments"
+version = "2.7.4"
+description = "Pygments is a syntax highlighting package written in Python."
+category = "main"
 optional = false
 python-versions = ">=3.5"
-version = "2.6.1"
 
 [[package]]
-category = "dev"
-description = "python code static checker"
 name = "pylint"
+version = "2.6.0"
+description = "python code static checker"
+category = "dev"
 optional = false
 python-versions = ">=3.5.*"
-version = "2.6.0"
 
 [package.dependencies]
 astroid = ">=2.4.0,<=2.5"
-colorama = "*"
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
 isort = ">=4.2.5,<6"
 mccabe = ">=0.6,<0.7"
 toml = ">=0.7.1"
 
 [[package]]
-category = "main"
-description = "Python parsing module"
 name = "pyparsing"
+version = "2.4.7"
+description = "Python parsing module"
+category = "main"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
-version = "2.4.7"
 
 [[package]]
-category = "main"
-description = "pytest: simple powerful testing with Python"
 name = "pytest"
+version = "6.2.2"
+description = "pytest: simple powerful testing with Python"
+category = "main"
 optional = false
-python-versions = ">=3.5"
-version = "6.0.1"
+python-versions = ">=3.6"
 
 [package.dependencies]
-atomicwrites = ">=1.0"
-attrs = ">=17.4.0"
-colorama = "*"
+atomicwrites = {version = ">=1.0", markers = "sys_platform == \"win32\""}
+attrs = ">=19.2.0"
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 iniconfig = "*"
-more-itertools = ">=4.0.0"
 packaging = "*"
-pluggy = ">=0.12,<1.0"
+pluggy = ">=0.12,<1.0.0a1"
 py = ">=1.8.2"
 toml = "*"
 
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = ">=0.12"
-
 [package.extras]
-checkqa_mypy = ["mypy (0.780)"]
 testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
 
 [[package]]
-category = "main"
-description = "A ``pytest`` fixture for benchmarking code. It will group the tests into rounds that are calibrated to the chosen timer. See calibration_ and FAQ_."
 name = "pytest-benchmark"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 version = "3.2.3"
+description = "A ``pytest`` fixture for benchmarking code. It will group the tests into rounds that are calibrated to the chosen timer. See calibration_ and FAQ_."
+category = "main"
+optional = true
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.dependencies]
 py-cpuinfo = "*"
@@ -451,31 +438,39 @@ elasticsearch = ["elasticsearch"]
 histogram = ["pygal", "pygaljs"]
 
 [[package]]
-category = "main"
-description = "Extensions to the standard Python datetime module"
 name = "python-dateutil"
+version = "2.8.1"
+description = "Extensions to the standard Python datetime module"
+category = "main"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,>=2.7"
-version = "2.8.1"
 
 [package.dependencies]
 six = ">=1.5"
 
 [[package]]
-category = "main"
-description = "World timezone definitions, modern and historical"
 name = "pytz"
+version = "2021.1"
+description = "World timezone definitions, modern and historical"
+category = "main"
+optional = true
+python-versions = "*"
+
+[[package]]
+name = "regex"
+version = "2020.11.13"
+description = "Alternative regular expression module, to replace re."
+category = "dev"
 optional = false
 python-versions = "*"
-version = "2020.4"
 
 [[package]]
-category = "main"
-description = "Render rich text, tables, progress bars, syntax highlighting, markdown and more to the terminal"
 name = "rich"
+version = "9.10.0"
+description = "Render rich text, tables, progress bars, syntax highlighting, markdown and more to the terminal"
+category = "main"
 optional = false
 python-versions = ">=3.6,<4.0"
-version = "6.1.1"
 
 [package.dependencies]
 colorama = ">=0.4.0,<0.5.0"
@@ -483,51 +478,48 @@ commonmark = ">=0.9.0,<0.10.0"
 pygments = ">=2.6.0,<3.0.0"
 typing-extensions = ">=3.7.4,<4.0.0"
 
-[package.dependencies.dataclasses]
-python = ">=3.6,<3.7"
-version = ">=0.7,<0.8"
-
 [package.extras]
 jupyter = ["ipywidgets (>=7.5.1,<8.0.0)"]
 
 [[package]]
-category = "main"
-description = "SciPy: Scientific Library for Python"
 name = "scipy"
+version = "1.6.0"
+description = "SciPy: Scientific Library for Python"
+category = "main"
 optional = false
-python-versions = ">=3.6"
-version = "1.5.2"
+python-versions = ">=3.7"
 
 [package.dependencies]
-numpy = ">=1.14.5"
+numpy = ">=1.16.5"
 
 [[package]]
-category = "main"
-description = "Python 2 and 3 compatibility utilities"
 name = "six"
+version = "1.15.0"
+description = "Python 2 and 3 compatibility utilities"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
-version = "1.15.0"
 
 [[package]]
-category = "main"
-description = "Python Library for Tom's Obvious, Minimal Language"
 name = "toml"
+version = "0.10.2"
+description = "Python Library for Tom's Obvious, Minimal Language"
+category = "main"
 optional = false
-python-versions = "*"
-version = "0.10.1"
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 
 [[package]]
-category = "dev"
-description = "tox is a generic virtualenv management and test command line tool"
 name = "tox"
+version = "3.21.4"
+description = "tox is a generic virtualenv management and test command line tool"
+category = "dev"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-version = "3.20.0"
 
 [package.dependencies]
-colorama = ">=0.4.1"
+colorama = {version = ">=0.4.1", markers = "platform_system == \"Windows\""}
 filelock = ">=3.0.0"
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 packaging = ">=14"
 pluggy = ">=0.12.0"
 py = ">=1.4.17"
@@ -535,89 +527,81 @@ six = ">=1.14.0"
 toml = ">=0.9.4"
 virtualenv = ">=16.0.0,<20.0.0 || >20.0.0,<20.0.1 || >20.0.1,<20.0.2 || >20.0.2,<20.0.3 || >20.0.3,<20.0.4 || >20.0.4,<20.0.5 || >20.0.5,<20.0.6 || >20.0.6,<20.0.7 || >20.0.7"
 
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = ">=0.12,<2"
-
 [package.extras]
 docs = ["pygments-github-lexers (>=0.0.5)", "sphinx (>=2.0.0)", "sphinxcontrib-autoprogram (>=0.1.5)", "towncrier (>=18.5.0)"]
-testing = ["flaky (>=3.4.0)", "freezegun (>=0.3.11)", "pathlib2 (>=2.3.3)", "psutil (>=5.6.1)", "pytest (>=4.0.0)", "pytest-cov (>=2.5.1)", "pytest-mock (>=1.10.0)", "pytest-randomly (>=1.0.0)", "pytest-xdist (>=1.22.2)"]
+testing = ["flaky (>=3.4.0)", "freezegun (>=0.3.11)", "psutil (>=5.6.1)", "pytest (>=4.0.0)", "pytest-cov (>=2.5.1)", "pytest-mock (>=1.10.0)", "pytest-randomly (>=1.0.0)", "pytest-xdist (>=1.22.2)", "pathlib2 (>=2.3.3)"]
 
 [[package]]
-category = "dev"
-description = "a fork of Python 2 and 3 ast modules with type comment support"
-marker = "implementation_name == \"cpython\" and python_version < \"3.8\""
 name = "typed-ast"
+version = "1.4.2"
+description = "a fork of Python 2 and 3 ast modules with type comment support"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "1.4.1"
 
 [[package]]
-category = "main"
-description = "Backported and Experimental Type Hints for Python 3.5+"
 name = "typing-extensions"
+version = "3.7.4.3"
+description = "Backported and Experimental Type Hints for Python 3.5+"
+category = "main"
 optional = false
 python-versions = "*"
-version = "3.7.4.3"
 
 [[package]]
-category = "dev"
-description = "Virtual Python Environment builder"
 name = "virtualenv"
+version = "20.4.2"
+description = "Virtual Python Environment builder"
+category = "dev"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
-version = "20.0.31"
 
 [package.dependencies]
 appdirs = ">=1.4.3,<2"
 distlib = ">=0.3.1,<1"
 filelock = ">=3.0.0,<4"
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 six = ">=1.9.0,<2"
 
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = ">=0.12,<2"
-
-[package.dependencies.importlib-resources]
-python = "<3.7"
-version = ">=1.0"
-
 [package.extras]
 docs = ["proselint (>=0.10.2)", "sphinx (>=3)", "sphinx-argparse (>=0.2.5)", "sphinx-rtd-theme (>=0.4.3)", "towncrier (>=19.9.0rc1)"]
-testing = ["coverage (>=5)", "coverage-enable-subprocess (>=1)", "flaky (>=3)", "pytest (>=4)", "pytest-env (>=0.6.2)", "pytest-freezegun (>=0.4.1)", "pytest-mock (>=2)", "pytest-randomly (>=1)", "pytest-timeout (>=1)", "pytest-xdist (>=1.31.0)", "packaging (>=20.0)", "xonsh (>=0.9.16)"]
+testing = ["coverage (>=4)", "coverage-enable-subprocess (>=1)", "flaky (>=3)", "pytest (>=4)", "pytest-env (>=0.6.2)", "pytest-freezegun (>=0.4.1)", "pytest-mock (>=2)", "pytest-randomly (>=1)", "pytest-timeout (>=1)", "packaging (>=20.0)", "xonsh (>=0.9.16)"]
 
 [[package]]
-category = "dev"
-description = "Module for decorators, wrappers and monkey patching."
 name = "wrapt"
+version = "1.12.1"
+description = "Module for decorators, wrappers and monkey patching."
+category = "dev"
 optional = false
 python-versions = "*"
-version = "1.12.1"
 
 [[package]]
-category = "main"
-description = "Makes working with XML feel like you are working with JSON"
 name = "xmltodict"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "0.12.0"
+description = "Makes working with XML feel like you are working with JSON"
+category = "main"
+optional = true
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
-category = "main"
-description = "Backport of pathlib-compatible object wrapper for zip files"
-marker = "python_version < \"3.8\""
 name = "zipp"
+version = "3.4.0"
+description = "Backport of pathlib-compatible object wrapper for zip files"
+category = "main"
 optional = false
 python-versions = ">=3.6"
-version = "3.1.0"
 
 [package.extras]
 docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
-testing = ["jaraco.itertools", "func-timeout"]
+testing = ["pytest (>=3.5,!=3.7.3)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pytest-cov", "jaraco.test (>=3.2.0)", "jaraco.itertools", "func-timeout", "pytest-black (>=0.3.7)", "pytest-mypy"]
+
+[extras]
+metrics = ["motmetrics"]
+video = ["opencv-python"]
 
 [metadata]
-content-hash = "eb36ed2f7d1eb2f1b1f75471d91eca2f793e2495d358392ce0f1e6a5a2184463"
-python-versions = "^3.6"
+lock-version = "1.1"
+python-versions = "^3.7"
+content-hash = "c5cdc57ccc24de48fb60c84f705884676b1647a93ab49f6eaffe3997c2f3524f"
 
 [metadata.files]
 appdirs = [
@@ -633,16 +617,19 @@ atomicwrites = [
     {file = "atomicwrites-1.4.0.tar.gz", hash = "sha256:ae70396ad1a434f9c7046fd2dd196fc04b12f9e91ffb859164193be8b6168a7a"},
 ]
 attrs = [
-    {file = "attrs-20.2.0-py2.py3-none-any.whl", hash = "sha256:fce7fc47dfc976152e82d53ff92fa0407700c21acd20886a13777a0d20e655dc"},
-    {file = "attrs-20.2.0.tar.gz", hash = "sha256:26b54ddbbb9ee1d34d5d3668dd37d6cf74990ab23c828c2888dccdceee395594"},
+    {file = "attrs-20.3.0-py2.py3-none-any.whl", hash = "sha256:31b2eced602aa8423c2aea9c76a724617ed67cf9513173fd3a4f03e3a929c7e6"},
+    {file = "attrs-20.3.0.tar.gz", hash = "sha256:832aa3cde19744e49938b91fea06d69ecb9e649c93ba974535d08ad92164f700"},
 ]
-certifi = [
-    {file = "certifi-2020.6.20-py2.py3-none-any.whl", hash = "sha256:8fc0819f1f30ba15bdb34cceffb9ef04d99f420f68eb75d901e9560b8749fc41"},
-    {file = "certifi-2020.6.20.tar.gz", hash = "sha256:5930595817496dd21bb8dc35dad090f1c2cd0adfaf21204bf6732ca5d8ee34d3"},
+black = [
+    {file = "black-20.8b1.tar.gz", hash = "sha256:1c02557aa099101b9d21496f8a914e9ed2222ef70336404eeeac8edba836fbea"},
+]
+click = [
+    {file = "click-7.1.2-py2.py3-none-any.whl", hash = "sha256:dacca89f4bfadd5de3d7489b7c8a566eee0d3676333fbb50030263894c38c0dc"},
+    {file = "click-7.1.2.tar.gz", hash = "sha256:d2b5255c7c6349bc1bd1e59e08cd12acbbd63ce649f2588755783aa94dfb6b1a"},
 ]
 colorama = [
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+    {file = "typed_ast-1.4.2-cp37-cp37m-manylinux1_x86_64.whl", hash = "sha256:987f15737aba2ab5f3928c617ccf1ce412e2e321c77ab16ca5a293e7bbffd581"},
+    {file = "typed_ast-1.4.2-cp37-cp37m-manylinux2014_aarch64.whl", hash = "sha256:37f48d46d733d57cc70fd5f30572d11ab8ed92da6e6b28e024e4a3edfb456e37"},
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+    {file = "typed_ast-1.4.2-cp38-cp38-manylinux2014_aarch64.whl", hash = "sha256:a38878a223bdd37c9709d07cd357bb79f4c760b29210e14ad0fb395294583787"},
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+    {file = "typed_ast-1.4.2-cp38-cp38-win_amd64.whl", hash = "sha256:c0c74e5579af4b977c8b932f40a5464764b2f86681327410aa028a22d2f54937"},
+    {file = "typed_ast-1.4.2-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:07d49388d5bf7e863f7fa2f124b1b1d89d8aa0e2f7812faff0a5658c01c59aa1"},
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+    {file = "typed_ast-1.4.2-cp39-cp39-manylinux1_x86_64.whl", hash = "sha256:d746a437cdbca200622385305aedd9aef68e8a645e385cc483bdc5e488f07166"},
+    {file = "typed_ast-1.4.2-cp39-cp39-manylinux2014_aarch64.whl", hash = "sha256:14bf1522cdee369e8f5581238edac09150c765ec1cb33615855889cf33dcb92d"},
+    {file = "typed_ast-1.4.2-cp39-cp39-win32.whl", hash = "sha256:cc7b98bf58167b7f2db91a4327da24fb93368838eb84a44c472283778fc2446b"},
+    {file = "typed_ast-1.4.2-cp39-cp39-win_amd64.whl", hash = "sha256:7147e2a76c75f0f64c4319886e7639e490fee87c9d25cb1d4faef1d8cf83a440"},
+    {file = "typed_ast-1.4.2.tar.gz", hash = "sha256:9fc0b3cb5d1720e7141d103cf4819aea239f7d136acf9ee4a69b047b7986175a"},
 ]
 typing-extensions = [
     {file = "typing_extensions-3.7.4.3-py2-none-any.whl", hash = "sha256:dafc7639cde7f1b6e1acc0f457842a83e722ccca8eef5270af2d74792619a89f"},
@@ -1001,8 +1052,8 @@ typing-extensions = [
     {file = "typing_extensions-3.7.4.3.tar.gz", hash = "sha256:99d4073b617d30288f569d3f13d2bd7548c3a7e4c8de87db09a9d29bb3a4a60c"},
 ]
 virtualenv = [
-    {file = "virtualenv-20.0.31-py2.py3-none-any.whl", hash = "sha256:e0305af10299a7fb0d69393d8f04cb2965dda9351140d11ac8db4e5e3970451b"},
-    {file = "virtualenv-20.0.31.tar.gz", hash = "sha256:43add625c53c596d38f971a465553f6318decc39d98512bc100fa1b1e839c8dc"},
+    {file = "virtualenv-20.4.2-py2.py3-none-any.whl", hash = "sha256:2be72df684b74df0ea47679a7df93fd0e04e72520022c57b479d8f881485dbe3"},
+    {file = "virtualenv-20.4.2.tar.gz", hash = "sha256:147b43894e51dd6bba882cf9c282447f780e2251cd35172403745fc381a0a80d"},
 ]
 wrapt = [
     {file = "wrapt-1.12.1.tar.gz", hash = "sha256:b62ffa81fb85f4332a4f609cab4ac40709470da05643a082ec1eb88e6d9b97d7"},
@@ -1012,6 +1063,6 @@ xmltodict = [
     {file = "xmltodict-0.12.0.tar.gz", hash = "sha256:50d8c638ed7ecb88d90561beedbf720c9b4e851a9fa6c47ebd64e99d166d8a21"},
 ]
 zipp = [
-    {file = "zipp-3.1.0-py3-none-any.whl", hash = "sha256:aa36550ff0c0b7ef7fa639055d797116ee891440eac1a56f378e2d3179e0320b"},
-    {file = "zipp-3.1.0.tar.gz", hash = "sha256:c599e4d75c98f6798c509911d08a22e6c021d074469042177c8c86fb92eefd96"},
+    {file = "zipp-3.4.0-py3-none-any.whl", hash = "sha256:102c24ef8f171fd729d46599845e95c7ab894a4cf45f5de11a44cc7444fb1108"},
+    {file = "zipp-3.4.0.tar.gz", hash = "sha256:ed5eee1974372595f9e416cc7bbeeb12335201d8081ca8a0743c954d4446e5cb"},
 ]
diff --git a/pyproject.toml b/pyproject.toml
index d7a5889d..176c35c0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "norfair"
-version = "0.1.8"
+version = "0.2.0"
 description = "Lightweight Python library for real-time 2D object tracking."
 license = "BSD-3-Clause"
 authors = ["Tryolabs <hello@tryolabs.com>"]
@@ -8,20 +8,22 @@ repository = "https://github.com/tryolabs/norfair"
 readme = "README.md"
 
 [tool.poetry.dependencies]
-python = "^3.6"
+python = "^3.7"
 filterpy = "^1.4.5"
-rich = "^6.1.1"
-opencv-python = ">= 3.2.0, < 5.0.0"
-motmetrics = "1.2.0"
+rich = "^9.10.0"
+opencv-python = {version = ">= 3.2.0, < 5.0.0", optional = true}
+motmetrics = {version = "1.2.0", optional = true}
+
+[tool.poetry.extras]
+metrics = ["motmetrics"]
+video = ["opencv-python"]
 
 [tool.poetry.dev-dependencies]
-pytest = "^6.0.1"
-# Had to disable black because of this: https://github.com/python-poetry/poetry/issues/2386
-# Please install separately for development.
-# black = "^20.8b1"
-isort = "^5.5.1"
+black = "^20.8b1"
+isort = "^5.7.0"
 pylint = "^2.6.0"
-tox = "^3.20.0"
+pytest = "^6.2.2"
+tox = "^3.21.4"
 
 [build-system]
 requires = ["poetry>=0.12"]