Hey Bryce
So the things you need.
Racechrono - This is the data logger. You download this to your Andriod or iPhone and just load up the software. So when you race you load up the race track your racing on. Press start and it does the rest So you download the software through your phone.
External GPS - This connects via blue tooth to the racechrono software. This is just for accuracy purposes. As the internal GPS in the phone is shit.
GoPro - Use this to record the video
When I race I mount my phone on the dash, that way I have live timing and sector times
Once finished export the Racechrono data logging to your computer.
Use racechrono2avi software to convert to avi.
Use a software program like Adobe Premier to overlay the two videos