Video in section

Hi there,

Any chance this happens to be the first section?

If so perhaps you can use the header element instead?
https://docs.generatepress.com/article/page-hero-background-video/

Let me know :)

No, it’s the 4. section. What can i do?

Something like this should help:
https://slicejack.com/fullscreen-html5-video-background-css/

Is it possible to insert a Video in a section and fill the hole section?

Should be able to.

Have you tried the solution in the linked article?

Can you link us to what you have so far?