code for testing opencv

DisplaImage.cpp

#include <stdio.h>
#include <opencv2/opencv.hpp>
#include <iostream>

using namespace cv;
using namespace std;

int main(int argc, char** argv )
{
    
    cv::VideoCapture vcap;

    if(!vcap.open("rtsp://admin:admin@192.168.101.123:80/0")) {
      std::cout << "Error opening the video stream, sorry" << std::endl;
      return -1;
    }

    double fps = vcap.get(CV_CAP_PROP_FPS);

    std::cout << fps << std::endl;

    std::cout << "Stream ok, waitkey" << std::endl;

    Mat edges;
    namedWindow("edges", 1);

    if (vcap.isOpened()) {

      std::cout << "VCap is open" << std::endl;

      for (;;) {

        Mat frame;
        vcap >> frame;
        
        if (frame.empty()) continue;

        cvtColor(frame, edges, CV_BGR2GRAY); 
        GaussianBlur(edges, edges, Size(7,7), 1.5, 1.5); 
        Canny(edges, edges, 0, 30, 3);
        imshow("edges", edges); 
        if(waitKey(30) >= 0) break;
      }
       
    }

    waitKey(0);

    return 0;
}