Just wanted to share what I've tried recently, and it seems to be working quite good, even with ambient lighting:
Even with ambient lighting, it has keyed out quite well:
MVI_8349 (0-00-11-09).jpgMVI_8349 (0-00-11-09)0.jpg
Note that this screen has been taken from the video, and I didn't changed the Marvel S-Curve profile to a better one before.
But still, with a good lighting, it can give reasonable and affordable results!