volkodav@Xubuntu-15:~$ sudo dpkg --purge libopencv-contrib2.4v5:amd64
dpkg: dependency problems prevent removal of libopencv-contrib2.4v5:amd64:
 gstreamer1.0-plugins-bad:amd64 depends on libopencv-contrib2.4v5.

dpkg: error processing package libopencv-contrib2.4v5:amd64 (--purge):
 dependency problems - not removing
Errors were encountered while processing:
 libopencv-contrib2.4v5:amd64