Select camera series have additional DSP hardware for running video and audio analytics packages from Cisco. I have not heard of any instance of 3rd party (i.e. not acquired via Cisco) functioning on any of the camera endpoints.
More information can be found here:
http://www.cisco.com/c/en/us/products/physical-security/video-analytics/index.html
Cheers!
Scott Olsen
Solutions Specialist
Bulletproof Solutions Inc.
Web: www.bulletproofsi.com