Your profit or lack thereof is not germane to the issue of rights. Easy enough to ask the people you shoot to say on camera that they give you permission to use their image and words in your project. It would be nice to have them sign a slip that says they agree to allow you to use their image and words for the contest video project. It becomes more binding, if you give them a dollar in exchange for the signature. The slip then says "in CONSIDERATION of the sum of 1 dollar, I hereby give permission...."
As far as locations, shoot in a public space or a private space where you have permission.
Recognizable art or sculpture in the shot requires artist's clearance.
Logos in public are not automatically forbidden, that's a common misunderstanding. But whether you show it and in what context, might bring on eventual inquiries from the logo owners. You have to be ready to defend your decisions. Read this comic book styled textbook
http://cspd.law.duke.edu/cspd/comics/pdf/cspdcomicscreen.pdf
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