If you don’t like the way a built-in component works, your only other option is to use custom code. There are topics in the forum about custom background videos. You have to come up with a place to host video. I like using cloudinary and vimeo. Basically you are just using the HTML5 video element.
See this post for an example → BG Video - Code for Amazon hosted video - #3 by Alistair_Gallop