eliminate some warnings

modules/saliency/src/motionSaliencyBinWangApr2014.cpp

@@ -479,7 +479,7 @@ bool MotionSaliencyBinWangApr2014::templateReplacement( const Mat& finalBFMask,
                 /////////////////// REPLACEMENT of backgroundModel template ///////////////////
                 //replace TA with current TK
                 backgroundModel[backgroundModel.size() - 1]->at<Vec2f>( i, j ) = potentialBackground.at<Vec2f>( i, j );
-                potentialBackground.at<Vec2f>( i, j )[0] = NAN;
+                potentialBackground.at<Vec2f>( i, j )[0] = (float)NAN;
                 potentialBackground.at<Vec2f>( i, j )[1] = 0;
 
                 break;
@@ -489,7 +489,7 @@ bool MotionSaliencyBinWangApr2014::templateReplacement( const Mat& finalBFMask,
           else
           {
             backgroundModel[backgroundModel.size() - 1]->at<Vec2f>( i, j ) = potentialBackground.at<Vec2f>( i, j );
-            potentialBackground.at<Vec2f>( i, j )[0] = NAN;
+            potentialBackground.at<Vec2f>( i, j )[0] = (float)NAN;
             potentialBackground.at<Vec2f>( i, j )[1] = 0;
           }
         }  // close if of EVALUATION

modules/tracking/src/tldDataset.cpp

@@ -52,7 +52,10 @@ namespace cv
 		cv::Rect2d tld_InitDataset(int datasetInd,const char* rootPath)
 		{
 			char* folderName = (char *)"";
-			int x, y, w, h;
+			int x = 0;
+			int y = 0;
+			int w = 0;
+			int h = 0;
 			flagPNG = false;
 
 			frameNum = 1;