Expose matchGMS to Python binder

modules/xfeatures2d/include/opencv2/xfeatures2d.hpp

@@ -986,8 +986,8 @@ CV_EXPORTS void FASTForPointSet( InputArray image, CV_IN_OUT std::vector<KeyPoin
         If your images have big rotation and scale changes, please set withRotation or withScale to true.
  */
 
-CV_EXPORTS void matchGMS( const Size& size1, const Size& size2, const std::vector<KeyPoint>& keypoints1, const std::vector<KeyPoint>& keypoints2,
+CV_EXPORTS_W void matchGMS( const Size& size1, const Size& size2, const std::vector<KeyPoint>& keypoints1, const std::vector<KeyPoint>& keypoints2,
-                          const std::vector<DMatch>& matches1to2, std::vector<DMatch>& matchesGMS, const bool withRotation = false,
+                          const std::vector<DMatch>& matches1to2, CV_OUT std::vector<DMatch>& matchesGMS, const bool withRotation = false,
                           const bool withScale = false, const double thresholdFactor = 6.0 );
 
 //! @}