一.讀取並播放的程式碼如下：

#include "pch.h"
#include <iostream>
#include <opencv2/core/core.hpp>  
#include <opencv2/highgui/highgui.hpp>
#include<opencv2/imgproc/imgproc.hpp>


using namespace cv;


int main()
{
    VideoCapture a;
    a.open("C://Users//lenovo//Desktop//geeksong.mp4
 
");
    while (1)
    {
        Mat frame;
        a >> frame;
        imshow("讀取視訊", frame);
        waitKey(600);

    }
    
    return 0;
}

 二.獲取攝像頭裡的視訊，只需要將讀取視訊的路徑改為0就可以了：

#include "pch.h"
#include <iostream>
#include <opencv2/core/core.hpp>  
#include <opencv2/highgui/highgui.hpp>
#include
 
<opencv2/imgproc/imgproc.hpp>


using namespace cv;


int main()
{
    VideoCapture a;
    a.open(0);
    while (1)
    {
        Mat frame;
        a >> frame;
        imshow("讀取視訊", frame);
        waitKey(600);

    }
    
    return 0;
}