Need help creating a static video/image background that DOESNT SCROLL

Site Reference: https://ktmerry.com/

Section: 3 (with the video and text over it

My website: Hayekstudios.com

Section I want to this done to:  The video that's under the "Head Creative" section

I would like to have this same effect on the video that I have playing on my homepage. Does anyone know how to make this happen? Thanks! 

You can use this code to Website > Website Tools > Custom CSS

[data-section-id="63e986a99f73082ef7d3dbc3"] {
    position: sticky;
    position: -webkit-sticky;
    top: 0;
}