$ sudo apt-get update
$ sudo apt-get install qtmultimedia5-examples 

qtmultimedia5-examples is installed in your system.

Make ensure the qtmultimedia5-examples package were installed using the commands given below,

$ sudo dpkg-query -l | grep qtmultimedia5-examples *

You will get with qtmultimedia5-examples package name, version, architecture and description in a table

qtmultimedia5-examples package basic information: