As it's a laptop, you are very limited with what you can do, as to me it sounds like a video card fault, which of course it integral with the mobo.
Have you tried lowering the video resolution? If it improves the situation it probably is still a graphics cared issue where where it is struggling when the resolution is pushed. Other possibility is the screen itself, which you can test by connecting to an external monitor.
Only other real test, if you have a spare HD, is to do a basic build of Windows with all the appropriate drivers and then try out YouTube and the camera. If it is still is a problem, then it's a hardware fault.