movement vector from video

hi,

i need to do a project something like in this video.
http://www.youtube.com/watch?v=y6izXII54Qc (newsbreaker game)

this is a project they are screening on theaters before the movie, and
the audience participates with the game (simple arkanoid game) via
changing their position or their hands position.

i've accomplished this with tracking changing blobs, and if the blobs
are on the right half side of the screen, i would consider a right
move, if they are on the left side of the screen, i would consider it
a left move. however, this would be a cheat and not the best way to do
it.

any suggestions?
.

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