Before overlay is created, get all currently played videos and only pause them

[timii]

Currently, all videos on the page are paused when the overlay is active AND all videos are unpaused when the overlay is exited.

Potential problem with this approach:
When there are multiple videos on the page and only one is playing, every other video is being unpaused when exiting the overlay.

Solution to the problem:
When creating the overlay, get only videos that are currently playing, save them in an array and only pause and unpause the videos in the array.