In bug #86410, composited video support, using the TexturMapper, was added. But it doesn't handle when the video needs to be cropped, as the case of theora codecs.
One approach can be to improve the TextureMapper::drawTexture() method allowing the video cropping using OpenGL. Look at the http://cgit.freedesktop.org/gstreamer/gst-plugins-bad/tree/ext/eglgles/gsteglglessink.c as an example.
Adding No'am :)
So we need to handle the GstCropMeta? Adding Miguel in CC.