Lessons with picture in picture video

[stevem5000]

I teach guitar to a few students.....I would like to be able to put a picture in a picture in the video....
Two cameras....one on me and the guitar....other camera a closeup on my fret hand...

Does anyone know how to do this...???

Sorry for posting in the Audio forum......but this forum has the most users and I thought I
might have a better chance of finding an answer here....

Many thankx
Steve