Kernel drivers for webcam

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After you plug in your webcame, the output of the following command should not be empty.

# ls /dev/video*
/dev/video0

sys-apps/usbutils provides lsusb.
See if your hardware is detected, e.g.:

# lsusb
Bus 001 Device 009: ID 046d:08d9 Logitech, Inc. QuickCam IM/Connect

For most USB webcame, make sure the following kernel options are enabled:
CONFIG_MEDIA_CAMERA_SUPPORT
CONFIG_USB_VIDEO_CLASS

evice Drivers  --->
    <M> Multimedia support  --->
        [*]   Cameras/video grabbers support
        [*]   Media USB Adapters  --->
            <M>   USB Video Class (UVC)                                        
            [*]   UVC input events device support                            
            <M>   GSPCA based webcams  --->
                <M>   SN9C20X USB Camera Driver