private slots:
    void on_pushButton_clicked();
    void cap(int par1, QString par2);

void MainWindow::on_pushButton_clicked()
{
    QCamera *camera = new QCamera(QCamera::availableDevices().at(0));
    //QCameraViewfinder *viewFinder = new QCameraViewfinder;
    //camera->setViewfinder(viewFinder);
    //viewFinder->show();

    imageCapture = new QCameraImageCapture(camera);
    connect(imageCapture, SIGNAL(imageSaved(int,QString)), this, SLOT(cap(int,QString)));
    imageCapture->setCaptureDestination(QCameraImageCapture::CaptureToFile);

    QImageEncoderSettings imageSettings;
    imageSettings.setCodec("image/jpeg");
    imageSettings.setResolution(640, 480);
    qDebug() << imageSettings.resolution();

    imageCapture->setEncodingSettings(imageSettings);

    camera->setCaptureMode(QCamera::CaptureStillImage);
    camera->start();

    //on half pressed shutter button
    camera->searchAndLock();

    //connect(imageCapture, SIGNAL(imageCaptured(int,QImage)), this, SLOT(cap(int,QImage)));
    //on shutter button pressed
    imageCapture->capture();

    //on shutter button released
    camera->unlock();

    qDebug() << "done";
}

void MainWindow::cap(int par1, QString par2){
    qDebug() << "captured";
}