Yes, Dtube is an app of Steem. Also, Steemit.com and Busy.org are apps of Steem. So, Dtube is one of the video apps connected to Steem. Dtube might be the best video Steem app. But there are others you could try. You could watch how-to videos on YouTube on how to use Dtube or other apps. There are probably posts that help explain how to use, Dtube, etc, as well.
RE: France 2016