NC is a one party consent state. So the audio would be admissible. But could be easily argued if it's left unattended.
The video portion should be admissible is most cases. It could be removed by court order if it could be proven a bathroom window or bedroom window (etc) is being recorded. A generalized view of a property as a whole or in part from your own property can be legal.
Recording video of someone's private property from public property can have its issues. Really "how often" is the controlling factor there from what I've seen.
Recording their property from their property, without consent... yeah
In general, unless you can prove stalking, strong potential for harm to arise from, or trespass... you can generally video record anything (excluding bathrooms, locker rooms, etc). You generally don't need to notice people they are video recorded, it usually that they need to be noticed they are being audio recorded. Lots of grey areas. For example you could audio record your own home, and as NC is a one party consent state it is all legal even when people visit and they are unaware. However. If you leave the room, but guests remain in the room, you are no longer a consenting Party...
Too many variables. In this it really boils down to context and what judge is reviewing the case