If you goto 14 seconds on this video:
http://www.youtube.com/watch?v=Qpbm3HZyjx8
(its only a sample of the video my friend made)
i was wondering how you do that effect of zooming in to the picture frame while the picture is moving... anyone hae any suggestions on how my friend might've shot it? (I haven't had contact with my friend for a while.... so thats why I can't ask him directly..)

Just a thought...the way I would have done it frame a constant color, i.e. Blue or green and key it out in post. Then replace the color with the picture of the couple walking. It can be tedious, but I've produced very similar effect accidentally just messing around with filming my green screen.

Do you know anything about the after effects program?
You can cut the image and insert all you want.
Another way is use a normal camera (not video camera) that can take various shots at once:
1- take many pictures of the couple walking
2- with your video camera film the girl holding each frame.
3- in your editing software combine all together.
Another way is to use chroma key - I think they used this one because that zoom looks a normal camera zzom.
Cheers

Guys... you're approaching this wrong. Those suggestions would work, but there's a MUCH simpler way.

In After Effects (or even FCP, though it'll be a lot more work) you want to create a sequence, or import a clip, which contains the contents of the frame. Then layer it over the video clip pushing in on the frame.

If your version of AE supports motion tracking, this will be really easy. Find the tracker, and learn how to use it (it's not very intuitive, read up online). Use perspective tracking, to track the four corners. Done!

If your version of AE (or some other program) does NOT support motion tracking, you're in for a fun time. You need to use whatever perspective controls it does offer to tilt and twist the second layer until it matches the frame. Then you need to keyframe those controls to match the frame throughout the movement. Go to the end and keyframe there. Play it, and stop as soon as it is out of whack. Keyframe there. Keep doing that, making closer and closer keyframes, until you've got enough.

If the picture frame contains black, you'll get nice glass reflections and highlights over the original video. Layer the new clip over with a blending mode like screen, or the opacity lowered, and you can coax those highlights into appearing on top of your new clip, making it look super real.

Thanks Titaniumdoughnut....
I thought about the chromakey method, but I thought that would've been pretty tedious work...

BTW I use AvidXpress (DV) to edit, is there a add-on I could buy to do the same things as AfterEffects? or would After Effects integrate pretty well with Avid?

After Effects can integrate with anything, simply because it supports the standard file formats, so you should be okay there. I'm not sure if there's a way to do this in AvidXpress DV.