As I still had the HyperDroste app on my old iPod I had a play with it.
The app is easy to use but what a kerfuffle transferring the video to the MacBook.
I though it was going to save the video clips to the iPod . Wrong. It generates the video but that has to be transferred to the MacBook by Air Drop. Took me a while to work out how as I last used Air Drop (sending a file between machines by W-Fi / Bluetooth) a few years ago.