How to turn off the internal camera of your laptop (Linux)

How to turn off the internal camera of your laptop (Linux):

Cameras are controlled by the uvcvideo kernel module.

You can disable the camera until reboot by opening a terminal and typing
sudo modprobe -r uvcvideo
You will be asked for your password, and after typing it, if there are no errors shown in the terminal, your webcam should be disabled.
If you got the error message: modprobe: FATAL: Module uvcvideo is in use. after trying to remove the uvcvideo module, you can try to force its removal with the following:  
sudo rmmod -f uvcvideo


To enable your webcam again, type
sudo modprobe uvcvideo
into terminal.


If you want the camera to be disabled when you reboot, then press
ALT+F2
and paste this command:

gksu gedit /etc/modprobe.d/blacklist.conf

You will be asked for your password. After giving it, a text file should open. Paste at the end of the text file on a new line:

blacklist uvcvideo

Then save the file and exit. Next time you start Ubuntu, the webcam should be disabled.

credit:
 https://askubuntu.com/questions/166809/how-can-i-disable-my-webcam