Do you have any old iPhones or iPads that you no longer use? Why not use them as a CCTV security camera to watch over your house. The CCTV Camera app will look out for any movement in the video feed and when there is will start recording until the movement has gone. Place the iOS device at a window looking out of the house. It will pick up people coming to your front door to deliver mail or packages. If an incident happens you will have video evidence of what happened. The video files are named with the date and time that they were recorded. Export or share the video via AirDrop, email, or iMessage using the standard OS sharing features.
The camera does not record well in the dark.