This page has the following:
http://www.nsa.gov/ia/_files/factsheets/macosx_10_6_hardeningtips.pdf
Disable Integrated iSight and Sound Input
The best way to disable an integrated iSight camera is to have
an Apple-certified technician remove it. Placing opaque tape
over the camera is less secure but still helpful. A less persistent
but still helpful method is to remove /System/Library/
Quicktime/QuicktimeUSBVDCDigitizer.component,
which will prevent some programs from accessing the camera.
To mute the internal microphone, open the Sound preference
pane, select the Input tab, and set the microphone input volume
level to zero. To disable the microphone, although it disables
the use of the sound system, remove the following file from
/System/Library/Extensions: IOAudioFamily.kext
Note on removing kext files: To make the system reflect the
removal of kext files, run the following command and reboot:
sudo touch /System/Library/Extensions