We have released the 4K version of the Zoom Player onyx skin:
http://www.zoomplayer.com/skins/gui/Onyx%204K.zps
To install, simply open the "Onyx 4K.zps"file within Zoom Player.
Make sure you are running version 9.5 to ensure it works correctly.
This skin can be used on a regular 1080p TV to help the visually impaired as it uses really big buttons and timeline fonts that are much easier to read.