How-To Geek: How to Film With Your Own Green Screen Using Your iPhone. “Blue and green screens are used by TV and movie studios to blend two videos by replacing the background with something different. You have that power on your iPhone and iPad and we’re going to show you how to use it.” It’s not perfect, but for a quick hack it’s not bad at all.
ZDNet: How to build a temporary green screen YouTube studio. The how-to is in the video, but the article accompanying the video is extensive. “One 10-minute client video we produced prior to YouTube cost thousands of dollars for bandwidth fees alone, and that was for just a few hundred views. Back then, you really couldn’t do broad-reaching video without a big budget. But now, because YouTube has removed the bandwidth budget from the equation, anyone can make and distribute a video. As we all know, millions of people do just that. Because so many people are producing videos (as well as social media posts), the cost of the gear for producing video has come down as well.”