My goal is to create a screen in which a video appears, whatever it is (player/layout), but when I play music or anything, the video does not stop playing, is it possible to do that or not?
Yes, it is. Just show your blocks to get help
This isn’t possible, else it would’ve been implemented to Youtube or any social media app 
But this is of course possible in MANY different ways (extensions, in-built component, webview)