How to add mov file animations to website?

I am working on a website in angular, and the designer has sent me alpha channel MOV files with animations that he wants me to use. How do I insert these animations into the site? Do I need to somehow convert them into JSON files? I also will need to have a setting where it only begins the animation once the user scrolls down to that part of the page. Any help for better understanding of including animations would be super helpful. Thanks!