Stopping video from playing when another video is selected

Greetings Heroes!

I have 4 small videos embedded into 4 separate layers in a 360 course. I want to keep the controls at the bottom, but I noticed if you click on the base layer and select another video (layer) the last one keeps playing.

I can't figure out how to keep the start, stop and pause controls intact (not covering them with hotspots) as well as ending the video when another layer is selected.