This is fairly easy in Vegas and would think other NLE’s make for an easy time as well.
Put your camera on a tripod and record you sitting ont the left, showing a middle and right hand seat. Then change seats to the middle and record that. Then repeat for the right hand side. If you’re doing dialog then you need to time this and speak at the appropriate times.
Then add all three clips to three tracks and select only the third of the frame showing where you are in the frame (I may not be explaining this well but I hope you get the idea).
