Failed to open /dev/video0

Question

fyc@fyc:/dev$ motion
[0] Processing thread 0 - config file /usr/local/etc/motion.conf
[0] Motion running in setup mode.
[0] Thread device: /dev/video0 input 8
[0] Thread is from /usr/local/etc/motion.conf
[0] Waiting for threads to finish, pid: 5978
[1] Thread started
[0] motion-httpd/3.2.6 running, accepting connections
[0] motion-httpd: waiting for data on port TCP 8080
[1] Failed to open video device /dev/video0: Function not implemented
[1] Capture error calling vid_start
[1] Thread finishing...

Environment

Answer