#include <QtAV>
#include <QtAVWidgets>
...
GLWidgetRenderer2 renderer;
renderer.show();
AVPlayer player;
player.setRenderer(&renderer);
player.play("test.avi");

import QtQuick 2.0
import QtAV 1.6
Item {
    VideoOutput2 {
        anchors.fill: parent
        source: player
    }
    AVPlayer { //or MediaPlayer
        id: player
        source: "test.mp4"
    }
    MouseArea {
        anchors.fill: parent
        onClicked: player.play()
    }
}