In the video we see many people stealing from porches with video cameras, and the author mentions that the police didn't take action even with video evidence.

While I think your suggestion would reduce the chance of theft, I think you overestimate the accuracy of the risk-benefit analysis happening in the thieves' minds, as well as the actual risk involved.

I mean, the activity is already dumb from a risk analysis point of view.

But if they don't know of a package, they won't try to steal it. That is the area that I do think would do well.