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The constructor have to be used like that:

    HOGDescriptor hog = HOGDescriptor(Size(64, 128), Size(16, 16),Size(8, 8),Size(8, 8), 9,DEFAULT_WIN_SIGMA,0.2, true,DEFAULT_NLEVELS);

or just:

    HOGDescriptor hog; //create with default parameters.

And use detect multiscale, not just detect:

    vector<Rect> found, locations;
    hog.detectMultiScale(img, found, 0, Size(8,8), Size(32,32), 1.05, 2);

p.p.
Look at peopledetect.cpp in sample dir of OpenCV.

The constructor have to be used like that:

    HOGDescriptor hog = HOGDescriptor(Size(64, 128), Size(16, 16),Size(8, 8),Size(8, 8),  9,DEFAULT_WIN_SIGMA,0.2, true,DEFAULT_NLEVELS);

or just:

    HOGDescriptor hog; //create with default parameters.

And use detect multiscale, not just detect:

    vector<Rect> found, locations;
    hog.detectMultiScale(img, found, 0, Size(8,8), Size(32,32), 1.05, 2);

p.p.
Look at peopledetect.cpp in sample dir of OpenCV.

The constructor have to be used like that:

    HOGDescriptor hog = HOGDescriptor(Size(64, 128), Size(16, 16),Size(8, 8),Size(8, 8),  9,DEFAULT_WIN_SIGMA,0.2, true,DEFAULT_NLEVELS);

or just:

true,DEFAULT_NLEVELS);//custom parameters
    HOGDescriptor hog; //create with default parameters.

    hog.setSVMDetector(HOGDescriptor::getDefaultPeopleDetector());//Dont forget to load SVMDetector:

And use detect multiscale, not just detect:

    vector<Rect> found, locations;
    hog.detectMultiScale(img, found, 0, Size(8,8), Size(32,32), 1.05, 2);

p.p.
Look at peopledetect.cpp in sample dir of OpenCV.

The constructor have to be used like that:

    HOGDescriptor hog = HOGDescriptor(Size(64, 128), Size(16, 16),Size(8, 8),Size(8, 8), 9,DEFAULT_WIN_SIGMA,0.2, true,DEFAULT_NLEVELS);//custom parameters
    HOGDescriptor hog; //create with default parameters.

    hog.setSVMDetector(HOGDescriptor::getDefaultPeopleDetector());//Dont forget to load SVMDetector:

And use detect multiscale, not just detect:

    vector<Rect> found, locations;
found;
    hog.detectMultiScale(img, found, 0, Size(8,8), Size(32,32), 1.05, 2);

p.p.
Look at peopledetect.cpp in sample dir of OpenCV.