How to video a band?

[Dr Evil]

I am planning to video some bands free of charge and then give them the footage to sell to the public as DVD's/Blu Ray disks as long as I get my copy. Can decent sound quality be achieved with really good camera microphones (two separate cameras) for "stereo" audio or would it have to be plugged into the mixing desk, how much hassle and extra setup time would this take-assuming I got permission? I am not a musician or professional recording artist/cameraman, though among my many other projects it's something I might aspire to later, after a bit of practice to see if I'm any good (not the musician bit though-well, definitely not a singer, thats for sure)

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