We frequently hear odd noises so I set up the video camera to catch what the cause was. There are a lot of times that animals are running around the yard. When we played back the video we got this. Beyond the door is a fenced yard so there would not have been any strangers walking past. That would not be a good explanation anyhow since the figure does not appear solid. The glass slider is open, just the screen is closed, so it is not a reflection.

I am a photographer http://imagesprophotography.com and I have seen things like this on TV, but in thousands of images I have never shot anything like this before. Usually I am explaining what is seen in an image. It is really creeping catching something like this.