Bearcat
Doesn't look 900m RVR which appears to be req mins for the Rnav appr from that face book video. Looks like pea soup.
It doesn't matter what the video shows or apears to show apart from the fact that it is foggy!
What matters for legality is what were the RVRs passed to the crew and when.
One can have above minimum RVR and still not have sufficient visual reference. Equally you can have a deterioration once inside the outer marker and still have enough visual reference.
In this case we do not at the moment have enough information to say whether or not the RVR was too low to make an approach.