Human Detection in Live IP Camera

We have live feed from IP Cameras running on our servers - 1000s of IP Cameras running on single server with 64 IP Cameras (at max) - on single screen (via iframe) and each IP Camera feed running on unique URL.

We want to detect human in the live feed. Live feed runs for 24hrs but our hours of importance is only an 8hr shift where we want the app/program to alert us whenever a human is detected in the region of interest. The region of interest will change for each camera and must be customizable via some gui (basic).

Whenever a human is detected in region of interest, the program should highlight which camera the human is detected in.

Kindly answer, whether you will run an AI program on each unique url (each having 1 camera feed) or on 1 collective page (each having 40/64 iframes of live feed)

Required:
1. AI Prog (most probably can take one from Github, many are available)
2. Detection must be real time (no delays)
3. Detection only for limited hours each day, within region of interest
4. Alert as soon as detected
5. Mention Camera Number/ID
6. Must run online/cloud
7. Must work on camera live feed (IP Camera - 3MP)

Look forward to working with you.