Acceder a la web cam con gstreamer

gst-launch-0.10 v4l2src ! ximagesink

gst-launch-0.10 v4l2src ! video/x-raw-yuv,framerate=15/1,width=320,height=240 ! ffmpegcolorspace ! ximagesink

gst-launch-0.10 v4l2src device=/dev/video0 ! decodebin ! ffmpegcolorspace ! autovideosink