I am planning on visiting a desert country in a few weeks, and naturally take a few pictures there. While browsing Instagram and the internet in general, I stumbled across photos which (at least to my amateur eyes) exhibited a similar effect: The (cloudless) sky has a very soft gradient, and the sun's glare appears to be dimmed, like behind a veil.
I have taken a screenshot from this video:
I understand that the result is most likely from a mix of conditions, equipment and post-production, I am not sure however, which of these factors prevails in this case.
My assumption is that some kind of ND or CPL filters have been used - is this correct?