The light that near the camera on my laptop is lighting although I'm not using it. Seems it's a virus or an unknown application. How can I detect the application/process that's using the camera ?
I just answered in linked question ( http://superuser.com/a/612272/233899 ):
Applications using "handles" to access various interfaces provided by OS. Device handles is actually "file handles".
Process Hacker ( http://processhacker.sf.net/ ) can search handles in all processes (Ctrl+F to open "Find handles and DLL's").
My webcam device handle was
I found that after comparing all \Device* handles opened by skype.exe while my webcam is on and off.