For the paranoid who must know exactly when people are coming over.
I've linked to the products I used for this project where I could. The Amazon links are affiliate links where I can earn a small commission at no extra cost to you.
PTZ Camera: Amcrest IP2m-863EW-AI (note: you def do NOT need a PTZ camera, I just think they're neat)
AI Accelerator: Google Coral USB
POE Switch: TP-Link TL-SG1016PE
UPS (battery backup): APC BX1500M 1500VA
NVR: taped together Python scripts
Object tracker: multi-object-tracker (SORT)
Notifications: Pushover