How is the animation implemented on the site?

Question

css

I saw an animation of the background image on the site. Looks big and attractive. Can you tell me how this is implemented? Are there frameworks to solve such problems? Link to the site with animation - to start the effect, you need to scroll down a couple of times. Not advertising.

Answer 1

so this is not an animation, but a video that just plays / pauses when scrolling, here is the link:
https://d1a7ww2h906b13.cloudfront.net/video/chuckI...