You play a video in Unity by using the example in the documentation:
http://docs.unity3d.com/ScriptReference/MovieTexture.Play.html
As you say, if you have a Quad with a texture on it, you can position the movie anywhere in 3d space. So yeah, if it's a into video, then have a scene with just a camera and a quad.
If you are importing an mp4 then you'll need a version of QuickTime on your Mac or PC that can process the mp4. (So check that the movie can be played by QuickTime.) As the docs tell you, this is used to do the conversion into Ogg Theora which is the supported video playback format.
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