Autplay / Autostart video when scrolled to / when enters viewport

Hello,

I’m trying to figure out how to make it so on my blog, video automatically starts playing when the user scrolls to it. When scrolling past, so that the video leaves the viewport, the video should stop. I’m looking for methods to do this with WordPress’s built-in video handler, with third-party sites like Vimeo or YouTube, and with direct URL links to video files. (But especially the latter two.) Ideally this would be something that could handle any video it encounters. This would ideally be something like a WordPress plugin, or a script I can load in my template files to automatically handle it so admins don’t have to do anything manually.

I figure this must be a popular topic these days but I can’t find much on it at all. Any ideas?

Thanks in advance,
Jeremy