How to customize standard html5 video player? In particular, what would be a sikbar with indication of buffering and fullscreen with my controls?

Question

JavaScript

You need to replace the standard html5 video player controls with your own. Everything is simple here. A bunch of manuals. But I ran into this problem. The first is fullscreen. My controls should remain in full screen. The second is sikbar. It should show video buffering. I found several manuals and examples, but they use canvas and do not work in fullscreen ( dailymotion.github.io/hls.js/demo for example). It also has to be responsive.
Thanks