I was just looking for a similar thing and found this (Perhapy it helps):

2004-09-13  Kay Sievers  <kay.sievers@vrfy.org>

	* hald/linux/multimedia_class_device.c:
	(multimedia_class_device_accept), (multimedia_class_pre_process):
	New file for initial support of video4linux devices. It's just
	a starting point and we need more input from users of v4l
	devices. For a simple webcam it currently looks like this:
	   multimedia.device = '/udev/video0'  (string)
	   info.category = 'multimedia'  (string)
	   multimedia.video.can_capture = true  (bool)
	   multimedia.audio.has_audio = false  (bool)
	   multimedia.tuner.has_tuner = false  (bool)
	   multimedia.linux.version = 'v4l'  (string)
	   info.udi =
'/org/freedesktop/Hal/devices/usb_device_5a9_a511_100_-1_noserial'  (string)

	* hald/linux/osspec.c:  Add the new multimedia_class_handler to
	probe for video device properties on device discovery

	* tools/device-manager/Representation.py: Change "video" to
	"multimedia" to have a nice icon for the screenshots :)

(bug triaging) Yes, this should be back on HEAD again.