In Computing Now. Looked at several examples of how to use security camera input for other purposes.
Surveillance Video: The Biggest Big Data
"Big data continues to grow exponentially, and surveillance video has become the largest source. Against that backdrop, this issue of Computing Now presents five articles from the IEEE Computer Society Digital Library focused on research activities related to surveillance video. It also includes related references on how to compress and analyze the huge amount of video data that’s being generated. ... "