CAMERA-QML
source code
https://sourceforge.net/projects/bacon-qt5/files/DEMO_SOURCE/camera-qml.tar.gz/download

just click anywhere on the image to see and hear the effects!
PRE STEP set up
for just the modules to get started with you can install just these
should work for almost all the demos you find.
using sudo apt-get install
qml-module-qtquick2
qml-module-qtquick-controls2
qml-module-qtquick-window2
qml-module-qtqml
qml-module-qtmultimedia