Preventing the player from freezing when opening or switching to another tab in the browser

I really need your help. I am trying to figure out if it's possible to modify my player, so that when the user is taking my course and opens a new tab in the same browser the player does not stop, but keeps going. So for instance, if the user is watching a video within the course and decides to open or switch to a new tab in the browser, the video keeps going on and the user can still listen to the video whilst browsing the web. Is that possible? I have not found anything yet!