diff --git a/cmvr-es/devices/camera/abstract_camera.h b/cmvr-es/devices/camera/abstract_camera.h
index 7bf2d637..16eaa5c0 100644
--- a/cmvr-es/devices/camera/abstract_camera.h
+++ b/cmvr-es/devices/camera/abstract_camera.h
@@ -134,6 +134,8 @@ namespace cmvr::device {
 
         virtual bool startStreaming() {return true;}
         virtual void stopStreaming() {}
+        virtual bool startOperationalActivity() { return start(); }
+        virtual bool stopOperationalActivity() { return false; }
         virtual bool controlPtz(PtzCommand command, bool stop, int speed) {
             (void)command;
             (void)stop;