Personally, you wouldn't need a camera for performing in the real world. I don't see much use of YouTube besides people commenting "Nice job but i figured it out" and "i figured it out but nicely done". Sure it can help if you want a magician's perspective, but the main effective way is to test it out on real people and see what they think. This is why I quit making videos for YouTube a long time ago because little kids kept flooding my comments box with those remarks. I was getting sick of trying to fool THEM, and not real audiences. So forget a camera, or at least an expensive one, and go perform for real people. However, Simon linked a very great website. Definitely go check it out.