All grade 6-12 students have accounts on Wevideo.com.
All you need to is visit Wevideo.com, choose Login and Login with Google.
Watch the following video for directions on how to record your screen and webcam at the same time. It was initially made for students doing conferences but the same instructions can be applied to any usage reason.
https://drive.google.com/file/d/1VFLGCDOocJy3S0OBTGsDXp1H2Yb6W8AU/view?usp=sharing