It helps if you've done this in a prior season or in the preseason, but there are several cookbook papers and a team with the right mix of people could pull this off in the build season -- but not without risk or expending additional resources that could possibly be spent elsewhere. There's no withholding allowance on software, so there are ways to buy time too.
This (
http://charmedlabs.com/default/?page_id=211, Pixy/CMUcam5) might be an interesting option, but the general availability doesn't line up well with this season. Short of this turning out to be a good fit and being generally available, the current way that is within the easiest reach for most teams seems to be running OpenCV or RoboRealm on the driver station as mentioned previously.