A short guitar video (of myself) that I recorded and edited recently in New Jersey.
Manually prefocusing two cameras on the position my guitar would be at was a challenge in itself. I actually took a cardboard box from a photography light stand and laid it in place as a marker for focusing. Took me about 3 tries to really guess exactly where my Ibanez guitar would be. I had external microphones from both cameras wired fairly close to where my small guitar amplifier was on the ground.
After setting the manual video exposures on both cameras, I started rolling and slid myself into position. Took me about 7 minutes on this take to get a 45 second musical passage that I was happy enough with.
Video post-processing first involved syncing the full 7 minute clips by matching peaks on the audio waveforms. After that, it was a matter of cutting to whichever video feed I wanted to be viewed for the guitar part being played. I did some color corrections, highlight tweaks, and selective saturation before rendering out the AVI file.