So, the Piano Guys made a pretty cool video a while ago where they had green screen footage chroma keyed and then inserted into 3D space as some sort of plane like object. The process can be seen in this video :https://youtu.be/mJiEXKF6WTI
I understand how to do lightsaber composition (by superimposing a shadeless cylinder on top of footage and then blurring and coloring it, however if there is a more efficient way, I would like to know.), and I understand the basic process of chroma keying, but once these steps are completed, I am somewhat confused about how to place these video in a 3D setup like he does in the video (having this way as opposed to simply overlaying the footage on top of the renders allows for paralax and such). I would like to do this with preferably as few steps as possible.
I have an idea on how I might do this, but I would like input from the community so I don't waste as much time. I'm thinking maybe to key out the green screen, export png sequences with transparency for every piece of footage, and then importing images as planes into a 3D scene, however this would not be very effective if I had lots of clips and I had to do the same thing for each one. Preferably, I would like to see the footage in the scene in real time (although the scene doesn't have to look rendered) while animating the camera and such.
Thanks a bunch!