I agree that a video can provide more context than text does. However, most videos I have received as bug reports in the past failed to do that. I just saw the user doing random stuff leading to random events. I'd say that often the most important thing to have is actually not a well-written bug report or a well-made video, but rather having access to the user's settings file and logs (if that exists for the application), as they often contain the explanation of why you don't see what the user sees.