#include <opencv2/opencv.hpp>
#include <opencv2/core.hpp>	
#include<iostream>
using namespace cv;
int main() {

	VideoCapture cap(0);

	if (!cap.isOpened()) {
		std::cout << "！！！";
		return -1;
	}
	Mat frame;
	bool judge = true;
	namedWindow("test1");
	while (judge)
	{
		cap >> frame;
		if (frame.empty()) break;
		imshow("test1", frame);
		if (27 == waitKey(30)) {
			break;
		}
	}
	destroyWindow("test1");
	return 0;
}