Added new qmake config option which enables real gimbal camera

Gimbal camera can be enabled and used for example with command:
qmake6 CONFIG+=gimbal && make && ./rtsp_ai_player ~/azaion/models/onnx/yolov8m.onnx

misc/rtsp_ai_player/aienginegimbalclient.cpp

@@ -108,7 +108,9 @@ void AiEngineGimbalClient::inferenceResultSlot(AiEngineInferenceResult result)
                  << "Name:" << object.classStr
                  << "Probability:" << bestObjectProb;
 
-        emit zoomToAiTarget(target);
+        if (mGimbalServer->isAvailable()) {
+            emit zoomToAiTarget(target);
+        }
     }
 
     /*