How to 'take' the background of a video?

I would therefore like to take the background of a video and put it in another video. The thing is that I have people who are moving in the video I want to take the background... I am new in after effects so take easy on me and sorry for my bad English.

See this page for an overview of compositing features do the kind of work you describe:

Using After Effects | Resources and overview compositing and transparency

Start here learn After Effects:

http://Adobe.LY/AE_basics

Tags: After Effects

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