i do this sort of thing in one of my studios. basically, all the tapes used for a music video are inserted in to the machines, and the timecode is read. this is synced with the music straight away. with home video camera, yes, you may experience tempo changes, if you try shooting on digital, it may help issues as it's very good for stability on tape speed. i own cameras aswell, but they're all pro ones, so therefor have a special "timecode out" bnc socket.
this is what id do though...
go to the locatin which you want to record this video. now you'll need to get a clapper board, or as someone mentioned, to blocks of wood. the only thing you can do is this..
hit record, hold the clapper or the blocks of wood infront of the camera, as soon as you hit them together, someone needs to start the music, maybe on a pa system, or if on a budget, a hi fi. the music has to be started on the second the blocks hit each other.
then, when recording all your scenes, do exactly the same.
when it comes to editing, in say adobe premiere, load ALL your video sequences in to adobe. double click them to open the new dialog box up, now locate the section where the blocks hit togeether, and use the frame button to be exact. as soon as the blocks hit each other, click MARK IN. adobe will now cut everything that hapened before this clap from the blocks. now do the same with ALL your videos in the arrangement window.
now, delete all the audio files that go with the videos, or mute them, (right click). you will now just need to move this one piece of audio to just after the "clap", and a little experimentation and trial and error will have to work here to get the lip sync. but once you find the exact frame for the audio to start, there should be no loss in sync.use the scrub feature and make sure in the preview options, the audio is selected.
unfortunately, all our video engineers here at the studio are all busy.
hope this helps.
rox.
(love wave studio)