Is there a good application for this, hopefully free, or maybe even built into something I already have?
What do people use to do this?
Thanks in advance for replies!

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Idk why I hit quote. oopssbtamu wrote:CineGobs Keyer is free and you can get good results. The result is as good as the background and lighting you use.
Waxinvoker is another freeware that can achieve good results.
To capture the entire person requires you to have the backdrop curve as it reaching the ground then spread across the floor so there is no seam.
Stephen.