QVideoWidget black window

Zola

I have added QVideoWidget as a child to QWidget, and I am trying to play local avi file, but without success. Here is the code:

#include "widget.h"
#include <QApplication>
#include <QtWidgets>
#include <QtMultimediaWidgets>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget window;
    window.resize(320, 240);
    window.setWindowTitle(QApplication::translate("childwidget", "Child widget"));
    window.show();

    QMediaPlayer *player = new QMediaPlayer;

    QMediaPlaylist *playlist = new QMediaPlaylist(player);
    playlist->addMedia(QUrl::fromLocalFile("/home/designer/Desktop/drop.avi"));

    QVideoWidget *videoWidget = new QVideoWidget(&window);
    player->setVideoOutput(videoWidget);

    videoWidget->resize(320, 240);
    videoWidget->show();
    playlist->setCurrentIndex(1);
    player->play();

    return a.exec();
}

I included multimedia, multimediawidgets and widgets in my .pro file.

Also gstreamer packages are installed with sudo apt-get install gstreamer* libgstreamer* and version is 0.10.

I am running Debian Wheezy on VMWare and trying to build that code for i386 Desktop machine.

Am I missing something important so this code won't work? Only I get is black QVideoWidget window inside parrent QWidget.