ignoring gear/brands, ill give a couple tips i learned from my mistakes, to make the whole process easier...
if youre playing music for a video, camera sound is just poopoo and I will 'x-out' of your video within seconds... even a Zoom across the room is much better than whatever camera you have, most likely even than the ones with 'great' sound
when you start the recording with video, do something very obvious and articulate sonically and visually- clicking two drumsticks together a few times is PERFECT;
That way you have a super clear indicator of where to 'sync' audio, instead of trying to 'read' bass technique.. thats barely easy live, let alone with computer playback.. there's just alot of subtlety and misdirection of the visual component of either right or left hand technique.
FWIW, I have tried to do the audio-then-video overdub thing, but I just do not like it.. it 'seems' too 'artificial' to me [i know such language is a little silly, but frankly with music, those esoteric feelings actually count], and I found it difficult to really make myself jive with the whole process (I do have a bit of a tendency to not play it the same twice ever...).. Even though its a personal problem, it does bring up the important issue of ''what if i play a badass solo with some 'accidental' lines that i could never do again''.. i know its rare, but lets give a complete picture to rule out incomplete processes...
for bonus points- If youre mic'ing, mic your amp appropriately, not the room if you can help it. Like i said, devices like the Zoom are pretty great, but if youre showing off some sweet tone gear, mic the ampp baby. Psst... Markbass... The Compressore is a FANTASTIC pedal.. the official video, however, is USELESS! crappy room-noise for such a subtle effect? It doesnt even make the amp sound good...
so to sum it up
1) do video and audio simultaneously, using appropriate audio recording devices and a seperate camera
2) Distinct indicators for A/V, like a clap
3)Do something that will work every time, rather than some weird convoluted system that involves recording twice for one take and having to 'nail it' when youre lip-synching
If i can play the snark, or the teacher if you prefer: If you couldnt lay down the track with the camera rolling, then you shouldnt perhaps be making a video.