The camera of the iPhone 6 can record videos with a frame rate of 60 frames per second. However, this setting is not enabled by default on the iphone 6, since the video capture at 60 fps needs twice as much disk space as the recording at 30 fps. However, it may be important for one or the other to record videos at 60 fps. We'll show you where you enable the settingon the iphone 6 to take videos at 60 fps.
Navigate for that from the home screen to Settings --> Photo & Camera
Now scrolls down a bit until you come to the section "camera". Here you can nowsee the entry "Record a video with 60 FPS". Enable this setting using the controller. You can now take on your iPhone 6 videos with a frame rate of 60 FPS.