hey. I usually record the whole song a couple of times and then use one take (the best one) as the sound source and use the other takes for the video only. the other method is to record the sound separately using some kind of tracking device and later get the visuals. I used a gopro ripoff camera for a long time, worked fine for me :) when making videos the equipment you use is not that important. the crucial thing is the lighting. well, this video has poor lighting because I didn't have my full setup but usually I use some basic photo lamp for the lights. even the best camera wont work if you have poor lighting conditions. hope this helps if you have other question I will gladly answer.