1.加载图片

#include "stdafx.h"
#include "highgui.h" 
#include <opencv2/opencv.hpp>
using namespace std;
using namespace cv;
int main( int argc, char** argv ) {  
  IplImage* img = cvLoadImage("lena.jpg");//加载图片
  cvNamedWindow("Example1", CV_WINDOW_AUTOSIZE );
  cvShowImage("Example1", img );
  cvWaitKey(0);  
  cvReleaseImage( &img );  
  cvDestroyWindow("Example1");
}

2.加载视频

#include "stdafx.h"
#include "highgui.h" 
#include <opencv2/opencv.hpp>
using namespace std;
using namespace cv;
int main( int argc, char** argv ) {     
    cvNamedWindow( "Example2", CV_WINDOW_AUTOSIZE );    
    //CvCapture* capture = cvCaptureFromAVI( argv[1] ); // either one will work    
    CvCapture* capture = cvCreateFileCapture("E:\\视频素材\\aaa.avi");    
    IplImage* frame;    
    while(1) {        
        frame = cvQueryFrame( capture );        
        if( !frame ) break;       
        cvShowImage( "Example2", frame );        
        char c = cvWaitKey(33);        
        if( c == 27 ) break;    
    }    
    cvReleaseCapture( &capture );    
    cvDestroyWindow( "Example2" );
}