It seems that gstreamer0.10-plugins-bad do not support opencv 2.4.0, and it is unlikely to support it in the near future. http://cgit.freedesktop.org/gstreamer/gst-plugins-bad/tree/configure.ac?h=0.10
Blocks: (none) => 6142
seems won't fix :(
Status: NEW => RESOLVEDResolution: (none) => WONTFIX