Is there a simple way to do a picture in picture effect (with unlimited levels of PIP?) Trying to do this for a recent project with anything else just did my h

Is there a simple way to do a picture in picture effect (with unlimited levels of PIP?) Trying to do this for a recent project with anything else just did my head in with complexity... (I guess the best i can think of as a comparison is the TED intro? where lost of different clips fly across the screen)