From my understanding there is no real way to automatically discover video (camera) sources in GStreamer. Listing all elements with a class of Source/Video would be a first step, but that doesn't tell you if you even have the necessary hardware present, let alone if a camera is actually connected or transmitting video. I suppose you could iterate through all Source/Video elements (and the available channels for each source, if it implements GstTuner), and try playing each one, however I imagine that would take some time.
Has anyone tried auto-discovery? I see someone put it on GSoC2007 idea page for PiTiVi:
http://live.gnome.org/GStreamer/SoC2007-Josh
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