Security researchers and curious individuals used dorks like this to find open cameras. The multicameraframe string was a common signature of a specific web interface structure used by many budget camera manufacturers. By finding these URLs, a user could theoretically click the link and view the camera's live feed or control its settings (pan, tilt, zoom) if the owner had not secured it.
While you should never use the inurl operator on Google to find random cameras online (this is unethical and often illegal), you can use it locally . inurl multicameraframe mode motion free
If you have generic IP cameras: