When doing a time lapse, the number of frames you need to capture per second is much, much lower than the number of frames you need to capture for live video. As such, I would not be surprised if the frames in this video were taken using the still 5MP camera and stitched together to create the video. So while the 1080p, 30fps end product might look great, it really has very little bearing on what the actual video capture looks like on the phone.