The iPhone is already capable of capturing smooth video even when you are moving. The Freevision Vilta SE 3-axis handheld stabilizer gimbal gives your videos a more cinematic feel though. It works with iPhone and Samsung smartphones and comes with convenient features such as focus & zoom.
This version can support portrait shooting now. It has POV, Kaleidoscope, face tracking and time-lapse modes. The battery lasts up to 17 hours. The gimbal has a max payload of 255g. It can pan and tilt 320 degrees.[where to get it]