Comment 2 for bug 698016

It would appear they're currently being distributed as part of the opencv-doc package and have been gzipped and moved to /usr/share/doc/opencv-doc/examples/haarcascades/haarcascades/

So you could potentially depend on that package and add support for gzipped cascades but that doesn't strike me as a terribly nice solution. Ideally they should be distributed in a non-gzipped form and installed to the most commonly used path (/usr/share/opencv/haarcascades).

 I'm not sure if libcv-dev is necessarily the best place to return these to though, since they have little to do with development and instead are runtime definitions for face/body detection, perhaps a separate opencv-haarcascades package?