C++ code to read images from webcam using CV 4.1.1

webcam_opencv.cpp

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

int main(int, char**) {
    // open the first webcam plugged in the computer
    cv::VideoCapture camera(0); // in linux check $ ls /dev/video0
    if (!camera.isOpened()) {
        std::cerr << "ERROR: Could not open camera" << std::endl;
        return 1;
    }

    // create a window to display the images from the webcam
    cv::namedWindow("Webcam", cv::WINDOW_AUTOSIZE);

    // array to hold image
    cv::Mat frame;
    
    // display the frame until you press a key
    while (1) {
        // capture the next frame from the webcam
        camera >> frame;
        // show the image on the window
        cv::imshow("Webcam", frame);
        // wait (10ms) for esc key to be pressed to stop
        if (cv::waitKey(10) == 27)
            break;
    }
    return 0;
}


// CMD to generate executable: 
// g++ webcam_opencv.cpp -o webcam_demo -I/usr/include/opencv4 -lopencv_core -lopencv_videoio -lopencv_highgui

// Note: check your opencv hpp files - for many users it is at /usr/local/include/opencv4
// Add more packages during compilation from the list obtained by $ pkg-config --cflags --libs opencv4

Yeah it's fine