I'm new to this community. I teach After Effects at Johns Hopkins University. In my own work I have been interested in attempting to create visual effects that look and feel like Analog Video feedback ? I was hoping I could find a plug in that allowed the user to create feedback - haven't found that though.
Andrei Jay (the guy from your video) is a sort of genius in video art. He implemented some free-to-use application, which you can find on GitHub. Try to search for information about Andrei, i think it is best way to learn about video synth software (the thing you looking for).