Yep, of course - as it was stated in the video, “open matte creation”; I used avisynth to clone existing parts to fill the blanks, and carefully choose the best part (of all frame) to use as “mask” to add to the black borders; it will work (almost?) perfectly just for few shots perfectly (where there are sky, space, desert, snow, rocks etc.) and somehow good for other static shots, depending one each one.
Don’t know how many footage is possible to use for recreation, but a quick estimation could be around few minutes for each movie; there are of course other possible techniques to use, but let this discussion for another post for the moment… 😉