I would like to add a video of a green-screened person into a scene in a video to stand behind other people standing in a group. This will potentially involve a small amount of motion tracking, layering, masking, altering lighting, and skin tone blending of original subject to final video, hue shift, chroma key spill removal, and partial re-masking of original video to make the new person appear to stand behind others. There is not a strict need to align against audio in the final video as the added person will not be saying anything but merely observing the group from behind. The objective is to make the final video look convincing. The intention of the resulting video is to be used within a larger video shown at a birthday party.
Here is an example of what I want to accomplish:
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