Background video is supposed to show well in tablets and smarphones?

Design help General
7

Here’s the public link. Thanks!! Check it in tablet and smartphone and you will see what I mean.

https://webflow.com/design/ninjanutz?preview=f78d32eae192d7dcf98de89df77f9633

EDIT: By the way, the navbar is completely crazy and moving out of its place when you scroll through the page, and the background image from the top disappears when you scroll down. Could you also help me with that??? I think the background video is messing with the code or something is screwing up the code.

Thanks!