First an apology about the sound quality, i struggled to record the recoding software and had toresort ot using a digital camers on a tripod.
Quick Setup Guide For The OBS studio Software
OBS studio is available for both Mac and windows, the mac will need additional software to add the built in microphone, check the help file.
It is a very usable software, once you have used it a few times and ralise it is based on a layer system - the top source is on top of the pile.
This tutorial shows you how to set the software up to record the basic video with a webcam on top in the corner.
If you have any questions or want to know more about it then please contact me or leave a comment below.
if you like the video please click the like button.
thanks for watching, i hope it was helpful.
ps the download is at https://obsproject.com/
for mac users you may need to install ishowu
you only need the free audio bit. (not tried the mac as a windows user, so anyone who does please chime in)