[Bug 748377] New: OpenCV face detection does not work with OpenCV newer than 2.4.10

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=748377

            Bug ID: 748377
           Summary: OpenCV face detection does not work with OpenCV newer
                    than 2.4.10
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: lrn1986 at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

$ gst-launch-1.0 autovideosrc ! video/x-raw,width=320,height=240 ! videoconvert
! facedetect min-size-width=60 min-size-height=60 ! d3dvideosink
OpenCV Error: Unspecified error (The node does not represent a user object
(unknown type?)) in cvRead, file
F:/e43/src/mingw/opencv-2.4.11-2/opencv-2.4.11/modules/core/src/persistence.cpp,
line 5008
terminate called after throwing an instance of 'cv::Exception'
  what(): 
F:/e43/src/mingw/opencv-2.4.11-2/opencv-2.4.11/modules/core/src/persistence.cpp:5008:
error: (-2) The node does not represent a user object (unknown type?) in
function cvRead

This seems to be happening because cascade format was changed in 2.4.11.
Previously it was:
<haarcascade_frontalface_default type_id="opencv-haar-classifier">
Now it is:
<cascade type_id="opencv-cascade-classifier"><stageType>BOOST</stageType>

This was caused by
https://github.com/Itseez/opencv/commit/7efc917ee0a57bb88855ac1c043f0d0f7bc8d873

Googling suggests that there's a new cascade loader that can handle these new
cascades, but i haven't been able to figure the details.

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