How to put a background video with full page fit

Hi I want to realize something like where I can put a video with autoplay on background
and other thinks upon it.
The main problem is that I can’t set the width and height with the 100% size of the screen.
Thanks for your help

nice article on this

Hi thanks for your reply, I did it one following a guideline like that but I mean if it’s possible to do the same
with Hype 3 and if you can explain me or tell me where I can find a tutorial or something like that.
The result I already done must be like this site but I want to try to do it with Hype 3.