This paper describes a distributed multi-user video analytics platform supporting multiple video providers and multiple analytics. Scalability, portability, adaptability and resiliency are the objectives of a well-integrated video analytics platform. Being an integrated system of systems comprised of various resource nodes, the challenges in building such an infrastructure ranges from efficient system interconnects to providing user affordances comparable with that of video providers. In this work we outline the challenges and approaches to solve them. SIGMA, a video analytics platform that was implemented to support very large networks of video infrastructures is presented in this context. Our implementation allows for integration of platform-neutral analytics and vendor-neutral video providers. The structure of the implemented platform lends itself to accommodating both real-time and on-demand analytics. Also, the platform is independent of any application domain.