Oh. I have an interesting idea in mind. It will not work as it is and might not be easily implementable, but it is an idea.
Make a material 2-sided material with texture of a landscape and sky. Now put a panner node on it to make the texture move towards the player. Apply that material to a sphere that encloses the player.
Definitely not be exactly what you are looking for but, just an idea that popped in my head 
Maybe you can find some inspiration and do something with it as I’m not an expert with materials.