#include <QApplication>
#include <QScreen>
#include <QMediaCaptureSession>
#include <QScreenCapture>
#include <QVideoWidget>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QVideoWidget videoWidget;
    videoWidget.show();

    QMediaCaptureSession captureSession;

    QScreenCapture *screenCapture = new QScreenCapture(&app);
    captureSession.setScreenCapture(screenCapture);
    captureSession.setVideoOutput(&videoWidget);

    screenCapture->start();

    return app.exec();
}