Sync video recording from two iphone 6 or 6+ I use my iPhone 6plus as a high speed video recorder of my son's golf swing. Is there a way to record two at the same time? I would like to capture the swing from behind and directly across (we both have iPhone's).

Thanks
It can be done, yes. However, it's somewhat involved.

One way would be start filming on both iPhones and then play a high-pitched sound of some kind. Then, later, you can use video editing software like Adobe Premiere, or Final Cut Pro (or even iMove, I suppose) to visually sync up the videos by looking at the audio tracks of both videos and aligning them up visually by looking at the sound spike created by the high-pitched sound played during recording.

This is kind of like what video professionals do when working with multi-camera setups. Not exactly easy. But technically possible, if you know how to do video editing.