CVTools will provide you with accurate point tracking, and provide
numeric outputs in a structure. It's also slow, buggy, and
requires a zillion support patches.
I saw that a couple of weeks ago and didn't worked because i'm on
Snow Leopard or something, so I couldn't even try...
The Kineme CVTools 0.2 release works with Snow Leopard --- if some
component isn't working on SL, it's a bug (please let us know
specifically what the problem is; email email@hidden offlist).
(Also I contend that it's not quite as slow or buggy as cwright claims
above.. :^] )