Cameras as Input Devices
A camera can be an input device.

IP cameras have multiple uses beside their role in video surveillance. Let’s talk a moment about the roles they can play within security alarm systems.
A camera can be an input device that is monitored by an alarm zone. When the image in the camera changes, or if AI (Artificial Intelligence) detects a human, it causes an alarm. That alarm can then be reported.
Cameras can monitor the health of visitors. Thermal cameras can detect people who have a high fever. That can cause an alarm.

