The answer is yes. Video and films can be valuable in the modeling process. In fact sometimes they are essential, in situations where live modeling is unsafe, or requires equipment that is unavailable.
There is a catch, however. Many films and videos, even if they are made to be used instructionally, do not contain proper cueing and explanations of the task to be used, and often simply are not instructionally sound.
The solution is to use the media effectively. For example, you can show the video segment (not the whole thing), stop it, reshow it in smaller chunks, intersperse the use of the medium with practice, and so on.
Video and films almost always require the trainer to figure out how to use them properly, and this is even more important when using video to model behaviors.