Yes. Demand 5 is available on all 2013, 2014 and 2015 models of Samsung Smart TV. From Thursday 17th November, My5 will be available on 2016 Samsung TVs and Blu-ray players.
Please check the Samsung support website for details of how to find which model you have.
Demand 5 on 2013, 2014 and 2015 Samsung Smart TVs
To find the Demand 5 app, go to the apps section of the smart hub, then go to video, and the Demand 5 app can be found by scrolling right.
Unfortunately, Demand 5 will no longer work on 2011 models. See this article for details.
My5 on 2016 Samsung TVs and Blu-ray players
From Thursday 17th November 2016, My5 will be available on 2016 Samsung TVs and Blu-ray players (see more).
The My5 app will be available via the Samsung App Store, which can be accessed by pressing the Samsung Home button on the remote control. You can then select the My5 application, and follow the on-screen instructions to install it.