Although not 100% sure, as long as you are doing it for a community website ( which is obviously related to ManiaPlanet), and you don't make profit with it, it should be allowed, or at least considered as "tolerated a grey zone"
Cerovan explained a few things here, in a topic regarding usage of music/skins/textures for a ManiaPlanet video contest:
http://forum.maniaplanet.com/viewtopic. ... 2&p=153740
The main concern here was to prevent the video makers from using copyrighted stuff from othere companies or persons.
If you still need a more precise answer, please contact Cerovan (if he doesn't respond by himself here within a few days).