Cloning Players In Premiere 7x
Record your video with your actor(s) doing whatever the script calls for, Move them to a different spot to act as the "clone" and record it as many times as you want.. Do not put them to close together, You must keep them seperated or they will be cut off during editing. (Tutorial video shot in campaign but works with multiplayer too of course)
source video
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Now open Premiere
Import your video file(s) and place them on the timeline, Put each clone on a seperate video track (right click "Video 1" and add tracks as needed) Make sure you have the Background (video with no players in it) on video track 1.
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Now go over to the effects window (Window>Effects) Scroll down and select Garbage matte from the Keying subfolder. Drag the effect on to your clone videos( Dont apply it to the background)

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Now click on effects controls(1) Expand the Garbage matte options. Adjust the Points(2) around the clone your working with.(put the size at 50% if you cant see the points)
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When you adjust the points around your clone you will see the video beaneath it on the timeline start to show. Do this for each clone video on all video tracks .

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That all there is to it, Now Export your video.

Final outcome