Take it a step further - an auto-off hardware switch.
When you go to Skype you have to flip it before audio/video works - and then once the webcam is no longer "in use" it flips the hardware switch so that it can't be triggered (as the user is not going to want to re-trigger it, nor is likely to remember to do so)
When you go to Skype you have to flip it before audio/video works - and then once the webcam is no longer "in use" it flips the hardware switch so that it can't be triggered (as the user is not going to want to re-trigger it, nor is likely to remember to do so)