For Pro and plus customers: - [x] the top video should begin playing when it's in the view port. - [x] Only one video should be playing at a time (this should be handled by the plyr instances) - [x] The video should be playing muted (@markeharding 's request) - [x] The video should unmute when clicked - [x] Scrolling out of the view port should stop the video - [ ] The video should resume playpack with audio in the modal pager / media modal when viewing the video in a single entity view