hi @butze,
while you're interested in #filmmaking and #commons and writing a thesis about #sharing, here something you might be interested in:

- #mediagoblin (decentralized (federated?) opensouce media sharing plattform)
http://mediagoblin.org/

- #plumi (opensource media sharing plattform)
There is an active project using it here: http://www.engagemedia.org/

Also have a look into the initiative #video4change
They have a nice collection of guides, manuals and other resources useful for video activists and those looking to use video for social change
https://www.v4c.org/en/about

About the sponsors behind v4c I'm a bit sceptical. But I guess the project itself is mainly independent.