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If you don't want it to do it you can right click on the video and disable hardware acceleration.
You get rough quality video then.
Even worse for me it wont clock up to 880/1375 when i load any game but leave youtube on in the background.!!!!!! Tried every catalyst 10.12's to 11.1's !
I really wish I stayed with my 4870 and just stayed at 1680x1050 with no aa.
Have you thought about closing the video when your gaming ?
I'm going out on a limb, but if I was a driver developer I don't think I would consider that people might need to game and watch a movie at the same time.
Maybe that's just me.
Any CPU faster than a single core Atom up should play back a HD film no trouble.