There are some existing products out there, but as far as I can tell they are all crappy, so that shouldn't discourage you. You do need to explain why your watch will be better than a $5 eBay watch.
However, as others have said, your presentation is terrible. You need clear photos of whatever you have, and clear explanations of what you have done and what you are doing. Forget the videos for now.
Right at the top, you need to say how the display will work, what the case and strap will be made of, and how long the battery will last.