Camera not recognized

[mus1c]

Code:

GUVCVIEW: couldn't open /root/.config/guvcview2/video0 for read: No such file or directory
V4L2_CORE: ERROR opening V4L2 interface for /dev/video0
V4L2_CORE: ERROR opening V4L interface: Device or resource busy
Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged

turns out that it sill did not work. There has to be clues here somewhere about the source of the problem.