videocracy n. (from Latin video, I see + Latin cratia, from Greek kratos, power, rule; cf. ideocracy) Ð the power of visual images in shaping contemporary societies; the crucial impact of television, cinema, internet, and advertising on public opinion, political affairs, market strategies, etc.
It is a video produced about a person that if produced in written form would be considered biographical in it's aspects.
Essentially, the moshing of video + biography.
Online researchsure produces a lot of vidography on celebrities these days!