Work with extension in fullscreen video tags

I'm trying to use extension and find a way to use it when

1. YouTube video is opened in a fullscreen mode (works perfect: https://share.cleanshot.com/lHR1hBCk)
2. Vimeo and Mux video is opened in a fullscreen mode (works partially, as only my video is visible, but toolbar and drawings are not: https://share.cleanshot.com/Wxcjs5pP )

Can someone help or guide me with this issue? I tried to work with DOM nodes and chnage z-index, absolute position and so on. But it doesn't help.