I'm not going to get into the way it works or all that you can do with a near infrared filter, but look for an upcoming post that does indeed get into all that.
Stream of Brick
This stream is missing much of what makes a stream a stream...water. If I really wanted to show how a near infrared filter could be used like a neutral density filter, I would have waited for the water to rise. The addition of bricks to a stream make up for the lack of water.