The video apparently shows various lights attached to a disk shape object. Every time the object was being focused by the camera, it zoomed off.
The object being a quad copter is one of the many speculations posted in the comment section of the YouTube video. A quad-copter is usually used for filming and hoaxers have recently used it to create UFO hoaxes. One commenter says that a noise coming from propeller engines can be heard in the video. Other commenters say that the mysterious UFO is a remote controlled craft based on the slow speed of the object.
Another version of the same object was also posted by another YouTube user. The video zooms in the object at a slower speed. Take a look at the video and comment what you think about it.