Many network cameras come equipped with motion detection capabilities. This feature allows the camera to detect movement within its field of view and can trigger various actions, such as:
If you run this dork (please read the ethical warning below), results often include: inurl viewerframe mode motion network camera
While this specific dork is old and many cameras have been secured or taken offline, the principle remains active. Modern equivalents search for: Many network cameras come equipped with motion detection
Here is why that article (or any article covering this dork) is interesting and what it reveals about internet security: inurl viewerframe mode motion network camera