Probably the camera “power” is always on as any other microcontroller on the same board, but is only active when called through the control bus or an interrupt, having an LED tied to the power rail would keep it on all the time whenever the lapop is on.

Then tie it to some signal or power rail that only gets enabled when the camera is in use, and that must be enabled for the camera to work, e.g. when there's power to the sensor itself.