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#include "opencv2/objdetect/objdetect.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"    
#include <stdio.h>   

using namespace cv;

int main( int argc, const char** argv )
{
    CascadeClassifier face_cascade("/path/to/haarcascade_frontalface_alt.xml"); // PUT YOUR OWN HERE!
    if ( face_cascade.empty() ) { printf("Error loading cascade file\n"); return -1; };

    Mat frame = imread("/path/to/image/with/faces.jpg"); // PUT YOUR OWN HERE!
    if ( frame.empty() ) { printf("Error loading image file\n"); return -1; };

    Mat frame_gray;
    cvtColor(frame,frame_gray,CV_BGR2GRAY);

    std::vector<Rect> faces;
    face_cascade.detectMultiScale( frame_gray, faces, 1.1, 2, 0|CV_HAAR_SCALE_IMAGE, Size(30, 30) );

    for ( size_t i=0; i<faces.size(); i++ ) 
    {
        rectangle( frame, faces[i], Scalar( 255, 0, 255 ), 2 );
    }
    imshow("faces",frame);
    waitKey();
    return 0;
}

don't think i can do with less ;)

#include "opencv2/objdetect/objdetect.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"    
#include <stdio.h>   

using namespace cv;

int main( int argc, const char** argv )
{
    CascadeClassifier face_cascade("/path/to/haarcascade_frontalface_alt.xml"); // PUT YOUR OWN HERE!
    if ( face_cascade.empty() ) { printf("Error loading cascade file\n"); return -1; };

    Mat frame = imread("/path/to/image/with/faces.jpg"); // PUT YOUR OWN HERE!
    if ( frame.empty() ) { printf("Error loading image file\n"); return -1; };

    Mat frame_gray;
    cvtColor(frame,frame_gray,CV_BGR2GRAY);

    std::vector<Rect> faces;
    face_cascade.detectMultiScale( frame_gray, faces, 1.1, 2, 0|CV_HAAR_SCALE_IMAGE, Size(30, 30) );

    for ( size_t i=0; i<faces.size(); i++ ) 
    {
        rectangle( frame, faces[i], Scalar( 255, 0, 255 ), 2 );
    }
    imshow("faces",frame);
    waitKey();
    return 0;
}

don't think i can do with less ;)