I don’t always carry my phone with me, and at night time, I can’t hear notifications when my phone is near me. It would be great if there was a standalone device, such as a bell or buzzer, that would be activated when the cameras detected a person. Something that could be heard and is loud enough to awaken anyone, or just sound when it was activated.
Here’s a place to start. There’s a Wishlist topic, too, linked from a comment there.