How to cut someone out of a video?

I have a video I recorded on my iphone 5, and I have an IMac desktop computer. Anybody know how I can cut someone out of my video? I don't want them in it but it's such a good video and can't be recorded again

Blur them out its the only easy and simple way to do it
hope this helped, and If anyone else comes up with a better way let me know
PS you can really only cut out a person from a picture

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