There was a Wired article[1] I saw here a while back about some of the tech being developed to do this (and much much more) dynamically for sailboat racing, filmed live from helicopter(s).

The technical challenges, as well as potential for live info-graphics in sport make this a pretty interesting area, and it's nice to see relatively modest setups capable of producing what were, until recently, digustingly complex and expensive video effects/compositing tasks.

[1] http://www.wired.com/playbook/2012/08/ff_americascup_ellison...