Hi, please somebody can say me how I can do this video effect. Thanks

what editing program do you use?

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Basically you will require a NLE package that supports multiple overlay tracks. You will need to use Picture in Picture to achieve the effect.

The principles of what you want to achieve are more adequately described in this post,

http://www.videoforums.co.uk/viewtopic.php?p=2274#2274

However, your moving paths will be much more complex.

Good luck

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