Roto will probably give you the best results. If you just want a rough and dirty result, but really quick try a difference matte: http://creativenewsblog.com/aftereffects/archives/difference-matte-effect-tutorial
I started posting tips and tutorials on my blog like this one: http://creativenewsblog.com/aftereffects/archives/using-echo-on-animated-stroke-path-tutorial
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