Not a video, but there is no better explanation of the theory of the various suspension changes and what they do in Elvos R/C Car Handling Guide
http://home.scarlet.be/~be067749/58/
Once you understand what camber/caster/roll centre/etc are, here are plenty of handling and setup guides to help you learn more
http://site.petitrc.com/Tech/TechnicalReview.htm