Intel Skylake Gen9 whitepaper mentions
"Texture samplers now natively support an NV12 YUV format for improved surface sharing between compute APIs and media fixed function units."
Intel Android 3D driver supports GL_EXT_YUV_target on Skylake.
However, Mesa doesn't support GL_EXT_YUV_target on Skylake.
Texturing from NV12 has been around for a while.
GL_EXT_YUV_target is about several things, including rendering to a YUV surface.
Can you be more specific about what feature you're exactly after so that maybe we can identify something already there that meets your needs.