My goal is to create a notification system that will alert me when the USPS truck stops at my mailbox is which is currently monitored by a RLC-810A camera. I'm hoping to somehow tie into the Survellance system that identifies when a vehicle passes (or ideally stops) next to my mailbox and then using perhaps Google's Vision API (or something similar) to identify the USPS truck by its logo. Then once the USPS truck has been identified as being next to my mailbox, to send an email alert that there might be snail mail in my mailbox.

Any help would be appreciated.

Here's a result of using Google Vision with a snapshot of a USPS truck next to my mailbox: