Native camera issue on HTC One S fixed.

Camera connect->disconnect->connect leads to sigsegv.
Apply properties method reimplemented.

modules/highgui/src/cap.cpp

@@ -448,13 +448,15 @@ VideoCapture::~VideoCapture()
 
 bool VideoCapture::open(const string& filename)
 {
-    cap = cvCreateFileCapture(filename.c_str());
+    if (!isOpened())
+	cap = cvCreateFileCapture(filename.c_str());
     return isOpened();
 }
 
 bool VideoCapture::open(int device)
 {
-    cap = cvCreateCameraCapture(device);
+    if (!isOpened())
+	cap = cvCreateCameraCapture(device);
     return isOpened();
 }