Watch a video at same time in JS

Is it possible to create some code in js that would allow someone to watch a video at the same time as someone else. if you were to do this would you use sockets or would there be an easier way to show the video like in php or sql. I'm trying to create a web player that stays in sync with all the clients. So in total I'm trying to create a video that can be changed and also could be stopped and started at any time and would stay in sync with all the other ones