Fixed top-coordinate output when -ext_output is used for video

AlexeyAB

2018-05-28 1b7a1a0f33538c9544ad4bf693b4a4247a5548b8

 src/http_stream.cpp

@@ -208,7 +208,7 @@
      cap = (CvCapture*)new cv::VideoCapture(path);
   }
   catch (...) {
      std::cout << " Error: Web-camera " << path << " can't be opened! \n";
      std::cout << " Error: video-stream " << path << " can't be opened! \n";
   }
   return cap;
}