The video will show you the truth about your game. Watching yourself on high-speed video is a very important and effective tool for improving any aspect of the game: technical, tactical, sometimes even mental. Video reveals an objective truth about your game and it's no exception that if you see yourself on the video for the first time, you're shocked in terms of how different your movements and strokes are comparing with your own feelings during live play.
However, you will appreciate the results and the informations you have gained about your own game, and you will find that you have learned about technical parts and movements that you did not even know existed. And that's simply because you could never see these movements with the human eye.