Depth of field is the term for how much of an area your camera keeps in focus. Moving your camera allows you to keep your subject clear, and make the background blurry. Use this video to get better control of your film making.
Of course, thanks to YouTube's video compression, it all looks blurry, but you get the point.
-Set your camera as far from your subject as possible.
-Use a tripod
-Open your Iris (Turn up your exposure if no iris control)
-Use manual focus to make your subject crystal clear, while the background has a bit of fuzziness to it.
Again, this looks much better uncompressed than it does here, but you get the point.