v4l2: open /dev/video0: Permission denied

If you try to stream using your webcam throught vlc or xawtv

vlc v4l2:///dev/video0
or
xawtv -c /dev/video0

 probably you will have this issue.
To solve it, you must add your user to the video group as follows:

sudo adduser username video
sudo usermod -a -G video username

where username is your user (whoami)
Now restart your computer

Enjoy it!

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