Installing:

You can import easily to your chrome with

your-folder-path$ git clone https://github.com/valterbarros/button-pause-youtube.git

this will create a new folder in your-folder-name

and with this you can import in your chrome acessing ... -> more tools -> extensions

you will need enable Developer Mode and click in load unpacked extension...

This will open a file manager and you have to find your-folder-path/button-pause-youtube-master and click in open to finish

Configuration:

Only one coriguration is necessary, set the shutcut to pause youtube video click in Keyboard Shortcuts

And set shortcut to pause youtube video I recommend ctrl+shift+p, select option global if you want pause youtube video from anywhere (even with chrome minimized).

To select which video you want take control: