Fixing some static analysis issues

modules/video/src/bgfg_KNN.cpp

@@ -89,6 +89,9 @@ public:
     nShadowDetection =  defaultnShadowDetection2;
     fTau = defaultfTau;// Tau - shadow threshold
     name_ = "BackgroundSubtractor.KNN";
+    nLongCounter = 0;
+    nMidCounter = 0;
+    nShortCounter = 0;
     }
     //! the full constructor that takes the length of the history,
     // the number of gaussian mixtures, the background ratio parameter and the noise strength
@@ -113,6 +116,9 @@ public:
     nShadowDetection =  defaultnShadowDetection2;
     fTau = defaultfTau;
     name_ = "BackgroundSubtractor.KNN";
+    nLongCounter = 0;
+    nMidCounter = 0;
+    nShortCounter = 0;
     }
     //! the destructor
     ~BackgroundSubtractorKNNImpl() {}

modules/video/src/lkpyramid.cpp

@@ -1451,7 +1451,7 @@ getRTMatrix( const Point2f* a, const Point2f* b,
     }
     else
     {
-        double sa[4][4]={{0.}}, sb[4]={0.}, m[4];
+        double sa[4][4]={{0.}}, sb[4]={0.}, m[4] = {0};
         Mat A( 4, 4, CV_64F, sa ), B( 4, 1, CV_64F, sb );
         Mat MM( 4, 1, CV_64F, m );