I need this too. We have a Kuna installed on our front door and it's as if all delivery people know it's there and they try their hardest to avoid its detection. I've seen UPS and USPS walk in very odd ways that just barely don't appear on camera and cranking the sensitivity up ends up catching all passing cars on our semi-busy road. I haven't found a good balance and they almost never ring the doorbell even if it's raining.

I need that, too! (Why can't FedEx be bothered to ring the doorbell?) I sometimes wonder if instead of video, it might be easier to do audio analysis to detect the sound of the UPS truck, which tends to be rather unique in my neighborhood.

Turns out my dog is a finely tuned audio analysis system capable of detecting UPS, USPS and Fedex vehicles within a half mile range.

Instead of ringing the doorbell, it could send a text-message. That way, if you have sleeping babies, you won't end up having to deal with them waking.