[feature request] add video player controls

[c-h-u-c-k]

Hello, I wonder if it would be possible to add custom controls on the first video player element found on the page, like this userscript does: https://greasyfork.org/en/scripts/390508-html5-audio-video-keyboard-shortcuts-with-osd So we could add for example the features listed in the userscript as well as play/pause and fullscreen and tie it to the api so we can program the keys we want to use as we can with the rest of your wonderful extension. Thanks