I guess it's a missleading title. Let me clarify it a bit.
With clip in another clip I mean a size reduced part of a clip to
be shown in another clip simultaneously.
E.g I have two clips, the main clip shows a house. The second one something totally different.
Now I want the second clip to be shown in a small rectangle on the first clip.
How can I "resize" one clip and let it overlap with the other?
I hope I chose the right words. Thanks in advance.