opencv下使用摄像头

opencv下如何使用摄像头，

#define  _CRT_SECURE_NO_WARNINGS

#include <iostream>
#include "opencv/cxcore.hpp"
#include "highgui.h"
#include "cv.h"
using namespace std;

int main()
{
  CvCapture* capture = 0;
  cout << "open camera" << endl;
  while (1){
    capture = cvCaptureFromCAM(0);
    IplImage* iplImg = cvQueryFrame(capture);
    if (!iplImg)
    {
      return 0;
    }
    cvShowImage("photo", iplImg);
    cvWaitKey(1);
  }
 
  cout << "close camera" << endl;
  return 0;
}