A 2K movie can be watched on certain models of the iPad. Models that have 2K capability include the iPad Air 2, iPad Air, iPad Mini3 and iPad Mini 2.
A 2K movie has a resolution of 2048 pixels by 1080 pixels. The iPads that display 2K have resolutions of 2048 pixels by 1536 pixels. The extra pixel resolution allows for navigation buttons or dropdown features while watching 2K content. The introductory level iPad Mini does not play 2K because it only has a resolution of 1024 pixels by 768 pixels. All iPad models with Retina displays can support 2K movies.