It's standard for video players to have the entire video player UI disappear when the mouse is still for a few seconds. This doesn't happen in the khan academy video player - the "energy points" thing only disappears if you move the mouse off of it. It's very distracting and sometimes blocks content, and it would be easier to focus on the video if it also disappeared :)

If the goal was gamifying it so that you can always see your progress that makes sense, but I think it would be less distracting if it was placed outside the video player.