There are plenty, but they're all very DIY and I don't think there are any turnkey solutions that you can just plug in and have work.

I think a better question is... why do we all need this? I get that everyone these days is afraid of everyone and everything, but it's not rational. Very few people actually need a doorbell camera.

And if something actually does happen where you think video evidence might be useful, nine times out of ten the police aren't going to help you anyway.