add SingleObjectTracker position xyz output

include/sv_algorithm_base.h

@@ -105,6 +105,9 @@ public:
   std::string getAlgorithm();
   int getBackend();
   int getTarget();
+  double getObjectWs();
+  double getObjectHs();
+  int useWidthOrHeight();
 protected:
   virtual bool setupImpl();
   virtual void initImpl(cv::Mat img_, const cv::Rect& bounding_box_);
@@ -114,6 +117,9 @@ protected:
   std::string _algorithm;
   int _backend;
   int _target;
+  int _use_width_or_height;
+  double _object_ws;
+  double _object_hs;
 };