There seems to be a void of FFMPEG/libav enabled normal RPMs for CentOS 6 and I got sick of installing DVRs from source, there are plenty for Fedora but Fedora is not a server/enterprise OS. I’ve updated/rebuilt a combination of some existing SPEC files for other distributions to work for CentOS, enjoy.

zoneminder-1.25.0-11.el6.x86_64.rpm
zoneminder-1.25.0-11.el6.src.rpm