Ubuntu SDK – How to Insert Video Element in Ubuntu Application

I saw on some sites that you can insert videos with the Video element by importing Qt 4.7 and QtMultimediaKit 1.1 . But I have an error by compiling the project (it's a tabbed touch UI project):

(file path)/Presentation1.qml:44 Type BackButtonTab unavailable
(file path)/ui/BackButtonTab.qml:4 module "Qt" is not installed
(file path)/ui/BackButtonTab.qml:5 module "QtMultimediaKit" is not installed
(file path)/ui/BackButtonTab.qml:4 module "Qt" is not installed
(file path)ui/BackButtonTab.qml:5 module "QtMultimediaKit" is not installed

/usr/lib/x86_64-linux-gnu/qt5/bin/qmlscene exited with code 255

I thought about adding Qt 4.7 and QtMultimediaKit 1.1 in the .qmlproject but it doesn't change anything

The message tells me that I have to install QtMultimediaKit and Qt, but I don't know how to do it. (I've got the same problem with 3D elements by importing Qt3D 1.0 or Qt.labs.threed 1.0 -> what's the difference between Qt3D 1.0 and Qt.labs.threed 1.0 ?)

I'm using Qt Creator 2.8.1 based on Qt 5.0.2 (GCC 4.7.3, 64 bit) built on Sep 16 2013 at 12:02:18 on Ubuntu 13.10.