I shoot everything on my Canon T3i, with a tripod, 50 mm 1.8 lens just like Bizarro said. I assure you though it will take some practice to learn your lighting, exposure, shutter speeds, etc. It won't be as easy as just hitting the record function and having a sweet looking film. I'm not trying to discourage you, but am telling you it will take some practice for sure until you are creating those clear crisp videos you see in advertising decks / tricks.