How to add autopause to vimeo video when iframe is hidden

Hi,

I am creating an interactive webpage where the viewers can click a number of different locations to bring up different informations. I included several videos on the webpage that viewers can access, however when the viewer exits by clicking another button to open up a different window on the side the video continues to play in the background. How do I add an autopause to stop the video from playing in the background when the viewer clicks else where on the webpage and brings out another information section. Thanks for your help !