add new version of CommandLineParser. add empty docs

samples/cpp/bgfg_segm.cpp

@@ -18,8 +18,8 @@ static void help()
 
 const char* keys = 
 {
-	"{c |camera   |true    | use camera or not}"
-	"{fn|file_name|tree.avi | movie file             }"
+    "{c  camera   |         | use camera or not}"
+    "{fn file_name|tree.avi | movie file        }"
 };
 
 //this is a sample for foreground detection functions
@@ -28,7 +28,7 @@ int main(int argc, const char** argv)
 	help();
 
 	CommandLineParser parser(argc, argv, keys);
-	bool useCamera = parser.get<bool>("camera");
+    bool useCamera = parser.has("camera");
 	string file = parser.get<string>("file_name");
     VideoCapture cap;
     bool update_bg_model = true;
@@ -37,7 +37,8 @@ int main(int argc, const char** argv)
         cap.open(0);
     else
 		cap.open(file.c_str());
-	parser.printParams();
+
+    parser.printMessage();
 
     if( !cap.isOpened() )
     {