[KMnO4]

I would be worried if there was a way to query the webcam LED. Ideally you want it controlled by the hardware: if power is going to the camera, power the light.

If it’s accessible via software, there’s the possibility that it can be controlled with software as well.

[InitialLastName]

Presumably there's a command that drives the common control point.

If there's a pin (or more likely, a USB control transfer controlling a pin) that controls the power state of the webcam (and thus the LED), you need to track the state of the pin anyway.