The new Apple iPhone 6s and iPhone 6S Plus all come with 4K video and the ability to capture 8mp photos from the 4K video.
There is nothing new in this trick, so I am hoping Apple make this feature even simpler. When I receive my iPhone 6S Plus I will be certain to test this out. The 3 photos from this post are embedded from my Flickr account and show Tiggy,Fury and George. If you want to examine the full resolution, just click on each shot. In total, I managed to extract 11 great motion shots from 4K video footage shot from my LG G4. I will add I did film this into the sun. Not ideal, but dogs and dogs and they have a mind of their own!