Is this not highly dependent on your location? In the US this is up to the state/county level. It is generally not illegal to film past your property line.
> It is generally not illegal to film past your property line.
In the US. In much of the world it is.
But again, enforcement of this is terribly weak. It is virtually impossible to verify, and even if the government somehow did, it is trivial to circumvent as you just have to tilt the camera a few degrees or slightly change the block-out zones on the camera, and you can't really see the difference from the outside. On top of the police having a vested interest in the breaking of this rule because it helps them tremendously during investigations.
It’s the difference between recording and monitoring. You’re allowed to record in a public space, but you’re not allowed to monitor it.