Honestly, what's the odds that this isn't the reflection from a car passing by, casting the glare of the sun through a window? It just seems really an odd shape, and while granted it does seem to have a humanoid form, curtains tied back or vertical blinds will cast a similar shadow.
I'm not debunking this, however I would like to see more things viewed from multiple perspectives than just being "OMG it's a ghost!"...
This isn't a knock against anyone here, so don't take it that way. I'm just pessimistic by nature, and I enjoy playing Devil's Advocate.