Smart Camera Networks (SCN) are becoming a fundamental piece of our intelligent cities, buildings and homes, progressively inserting themselves in our lives. Achieving security in such a dynamic and heterogeneous environment is a challenging task. This means that applications for Smart Camera Networks need mechanisms for self-adaptation and for self-protection based on the dynamic reconfiguration and adaptation of the algorithms used to provide security. In this paper, we propose a self-adaptive security solution for SCN based on the combination of the MAPE-K reference model to dynamic negotiate and deploy of security policies, and DSPL approach to reconfigure the security level of the applications at runtime and monitor the changes in the context. The novelty of our approach comes from dynamic negotiation of security policies and automatic reconfiguration of security level to instantiate the new security policies at runtime in order to be capable of deploying adaptive security mechanisms to satisfy different security needs at different conditions.