In this post you are going to see how to make picture in picture video using movavi video editor plus 2020

Drag & drop the video on timeline. Play it to check it.
Now drag & drop other video on top of the video on timeline.
Play it to check.
You can see it overlaps previous video.
Double click on this video on timeline. In clip properties click on overlay tab.
Click on picture in picture.
Drag & drop this box where you want it to appear on screen