This paper describes an agile model-driven generative software development paradigm supported by mainstream tools to offer a significant leverage in hiding commonalities and configuring variabilities across families of video surveillance products while maintaining the new product quality. The integration of Agile and SPL (Software Product Line) paradigms is promoted to develop video surveillance systems as a pay-as-you-go fashion rather than developing an ex-nihilo new product, despite the perceived incompatibilities of these paradigms and potential challenges of such integration.