Truthfully the iPhone 6 does not support 4K video. That is, at least, not officially.
Luckily, by means of an app, you can make it happen and push the video recording resolution of your iPhone or iPhone 6 Plus way beyond its specified 1080p standard towards something pretty close to 4K!
Vizzywig 8xHD
i4software’s Vizzywig 4K made Ultra HD video recording possible on an iPhone 6 by shooting 24 high resolution photos per second and then combining them into 4K video clips. The big catch was the price – the app would set you back an eye-watering $1,000 from the App Store. But hey! The price has now dropped to $49.99!
Ultrakam 4k
First up is Ultrakam 4k, by Hassan Uriostegui. Available for $9.99 from the iTunes, it’s a fully-featured video recording app which has previously delivered 2K and 3K video recordings on older iPhone handsets. This latest version adds 4K capability to the iPhone 6 and iPhone 6 Plus along with a host of other useful features.
ProCam 2
Another option is ProCam 2 – Camera and Photo Editor, by Samer Azzam.
ProCam 2 costs $1.99 from the app store, but to unlock the 4K video recording you’ll have to make an in-app payment of $4.99, making it still a little less expensive than Ultrakam 4k.
You may really enjoy the superb video quality that you will get off these apps but don’t forget that Ultra HD video also consumes far more storage than regular HD video: a one-minute clip consuming anywhere from 800MB to 2GB depending on the app and settings used. This means you’re likely to run out of space pretty rapidly on your iPhone!
A good question to ask yourself is, “Do I really need a 4K video?”
Source: Forbes.com