HELP NEEDED! creating a fixed block upon scroll

Hi! Is anyone able to help me with a website block query. I want to have a video as the first thing that appears on my page, and I Want someone to scroll down to reach a text block. However, I want the video to be fixed on the page and not move when scrolling occurs, so it appears like the text is moving when actually you are scrolling.

Does anyone have any code that could help this?

I think you can add a section with background video, then add text over it, then share link to page. We can try a CSS position fixed to achieve this