Hmmm, if you mean "live" as in realtime then unfortunately in the Lab products is not possible as they are for post production work. For this you need for example, Adobe Ultra or a piece of equipment called a genlock which is the same as the weatherman uses to overlay themselves over the map.
If you don't mean "live" realtime, then you just import your greenscreen footage and apply a colour key to your green background. More information can be found here on how to composite: http://fxhome.com/support/video-tutorials/category/4/compositing#s1
Look under the keying category.
As for the film project it is still in post production. More news on this will surface when we have something interesting to say.
Take care and Merry Christmas.