sudo dpkg -r libopencv-video2.4v5:amd64 
dpkg: dependency problems prevent removal of libopencv-video2.4v5:amd64:
 gstreamer1.0-plugins-bad:amd64 depends on libopencv-video2.4v5.
 libopencv-contrib2.4v5:amd64 depends on libopencv-video2.4v5 (= 2.4.9+dfsg-1ubuntu6).
 libopencv-legacy2.4v5:amd64 depends on libopencv-video2.4v5 (= 2.4.9+dfsg-1ubuntu6).

dpkg: error processing package libopencv-video2.4v5:amd64 (--remove):
 dependency problems - not removing
Errors were encountered while processing:
 libopencv-video2.4v5:amd64