QCamera (on Windows 7) re-sizing does not work, window grows only bigger not smaller.

[cnc-bert]

I just want a simple Camera webcam vieuwer in my App.

The code below works, but the window can only be size bigger, smaller does not work.
Also KeepaspectRation isnt working,etither

1. How can I solve this?
2. I want to draw a simple cross with 2 lines over the camera image view, how can I do that?
3. How can I show the image in e.g. a QLabel?

This is my code, standard Qt creator project:

CameraWindow::CameraWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::CameraWindow)
{
ui->setupUi(this);

//QAbstractVideoSurface

camera = new QCamera;
viewFinder = new QCameraViewfinder;
viewFinder->setAspectRatioMode(Qt::KeepAspectRatioByExpanding);
viewFinder->show();

camera->setViewfinder(viewFinder);
camera->setCaptureMode(QCamera::CaptureStillImage);
camera->start();
this->setCentralWidget(viewFinder);

}