Ok 4 raspberry pi 3 have been prepped and setup or continuous recording at 800x640 and 15 frames per second . The files are saved 600 seconds at a time in MPEG 4 .avi . Recording to 64 Gb on a Sandisk 64 Gb high endurance card ( specifically for continuous video recording)

and the drilling begins, I use a stepper bit to carefully get to a hole diameter close to the camera sizes

I added the two IR leds to the camera which come on in low light and have an adjustable pot on each board. I will likely use clear epoxy to seal the sensors and plastidip to make the board water resistant. The plastidip peels off if needed.

Straight forward view