Youtube can now display not just 4K videos but also in 8K (or 7680 × 4320 pixel resolution) videos. and the first 8K short video was recently published on the website and you can (more or less) check it out on above.
[The Video was shot in] Portrait orientation and then stitched together in Adobe After Effects. Some shots simply scaled up by 125% from 6.1K to meet the 7.6K standard. Handheld stuff was just 6K FF. Scaled up by 125% and sharpened up a bit more than the others. The slider shots that had the secondary pan/tilts in them were also 6K FF. The true 8K shots were the ones that just had pans or tilts or simple dolly moves with no pan/tilt action.
This is obviustly a very complex technique which isn’t practical for most video/film creators at the moment. However there are several cameras which can shoot 8K natively without complex post processing. One of them is the new RED 8K Weapon which will be available later this year with an unbelievable resolution of 8192×4320 and a 8K 75fps mode.
Still you might ask, and rightfully so, how can you actually enjoy 8K as there are no commercial displays which support this standard at the present time. There is no real answer at the moment although 8K prototype displays have been around for several years (like the 8K Sharp display shown below with 33 MegaPixel resolution).
The first 8K TV display shown in Japan back in 2011