refactoring

samples/gpu/pyrlk_optical_flow.cpp

 #include <iostream>
 #include <vector>
 
-#include "opencv2/core.hpp"
-#include "opencv2/core/utility.hpp"
-#include "opencv2/imgproc.hpp"
-#include "opencv2/highgui.hpp"
-#include "opencv2/video.hpp"
-#include "opencv2/cudaoptflow.hpp"
-#include "opencv2/cudaimgproc.hpp"
-#include "opencv2/cudaarithm.hpp"
+#include <opencv2/core.hpp>
+#include <opencv2/core/utility.hpp>
+#include <opencv2/imgproc.hpp>
+#include <opencv2/highgui.hpp>
+#include <opencv2/video.hpp>
+#include <opencv2/cudaoptflow.hpp>
+#include <opencv2/cudaimgproc.hpp>
+#include <opencv2/cudaarithm.hpp>
 
 using namespace std;
 using namespace cv;