APP? Detect movement on display (NOT camera, but movement on screen) - Android Q&A, Help & Troubleshooting

Hi all,
Is there any app that can be used to detect movement on what is being displayed on the screen. So not using the front or rear camera.
The use case is a wireless endoscope camera, you connect to the wireless signal and it streams the feed direct to your phone (not connected to internet, just 30m away from the transmitter box). I want to then leave my screen open and if there is any movement on the screen for it to alert me.
I understand it will drain battery having the screen on for hours but I dont mind that, its for watching wildlife.
There is no app available that will connect to my endoscope camera that also has motion detection and the only way I can think of getting this to work is having a second phone pointing at the first phone and have the motion detection on the second phone haha. If i can do it all on one phone that would be great but not sure if there is any app that will notify me of changes in the feed of an app, or change of the display.
Any ideas?

Also forgot to say the phone is rooted (Samsung S8) encase that helps with the options

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