The Axis P1347 Camera has Tamper detection.
It can detect if the camera lens is covered (spray paint, baseball cap etc.)
You can use the tamper detection to send an email or run a siren.
To run the siren, have the camera close the circuit when all is ok and then break the circuit on tampering. Then put the siren on a relay that activate the siren when the circuit is broken, that way the siren also is activated if power is cut to the camera or if the cable between the camera and siren is cut.
Remember to stop the siren after a while to give your neighbors some peace.
See configuration screenshot below.