2 parts to my problem, first...
we have all seen the gallery effect where you get a smooth transition of the "frame" between different size images. Can anyone point me to a good tutorial on doing that. I use tweenmax, by the way, so something incorporating that would be good.

second and harder issue...
I am actually doing this for video. I assume the principle will be the same.
here is a problem though. I have a show reel, some video is 16:9 with black bars top and bottom some is 4:3. it is all in one video file. How can I adapt to the size as it changes within the reel? I do not want to have black bars as it is on a white background. Can I do it with cue points? Would a scaling mask work?