Failed to open /dev/video0: No such file or directory

Usage: v4l2-dbg [options] [values] -D, --info Show driver info [VIDIOC_QUERYCAP] -d, --device=<dev> Use device <dev> instead of /dev/video0 If <dev> starts with a digit, then /dev/video<dev> is used -h, --help Display this help message --verbose Turn on verbose ioctl error reporting -c, --chip=<chip> The chip identifier to use with other commands It can be one of: bridge<num>: bridge chip number <num> bridge (default): same as bridge0 subdev<num>: sub-device number <num> -l, --list-registers[=min=<addr>[,max=<addr>]] Dump registers from <min> to <max> [VIDIOC_DBG_G_REGISTER] -g, --get-register=<addr> Get the specified register [VIDIOC_DBG_G_REGISTER] -s, --set-register=<addr> Set the register with the commandline arguments The register will autoincrement [VIDIOC_DBG_S_REGISTER] -n, --scan-chips Scan the available bridge and subdev chips [VIDIOC_DBG_G_CHIP_INFO] -w, --wide=<reg length> Sets step between two registers --list-symbols List the symbolic register names you can use, if any --log-status Log the board status in the kernel log [VIDIOC_LOG_STATUS]