Hiya
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I'm not nearly as good as Carl, but I may be able to help
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Depends what you are using. In Movie Maker I don't think it is possible, but I use MoviePlus 5, which you can. I THINK it would be similar to other programs aswell
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Insert a video track and drop a clip onto it.
Resize it and move it where you want.
Hope this gives a rough idea
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