A friend of mine sent me a link to this video:

After investigation (ok! clicking on the link), I found out that this video is part of a project on happiness: Happiness seekers. It’s a documentary on happiness. You can watch a serie of interviews HERE.

I wanted to check if the project was not a religious or political propaganda so I investigated further more (ok! I googled) and found out that there were several documentaries on the subject in the doing. For example, The H-factor explores happiness through the eyes of Kayla, a nine year old girl.
An other project with no date or video has an interesting list of interviewees.

I am looking forward to the release of all those documentaries☺