This video is a high quality training video from The Guerrilla CG Project ( guerrillacg.org ) a non for profit organisation dedicated to teaching the fundamentals of computer graphics.
Primitives are objects like spheres, cubes and cylinders. These objects are a handy starting point for any model. Take for example this lizard which we make using primitives.
Author: Andrew Silke
For more information about Computer Graphics and higher quality videos visit The Guerrilla CG Project