Scroll Animation VIdeo Mask

Hi I was hoping to replace the first image in this clone with a video that plays on a loop with no/play pause option. I can’t seem to understand how the mask works and how to put a video instead of an image there. I successfully replaced the images but no luck on the video.

Template link:

I want to replace the models sitting with a background video.

How would I go about doing that? But still keep the scrolling image effect?

Here is my public share link: Webflow - PUSO Proof of Concept