Today we have come across a newly created HikVision YouTube channel called 'HikVision Explains' (created 4 days ago), currently it only contains just two videos.
One of those is a kind of tutorial / walk-through on the new features delivered by this NVR firmware i.e. V4.1.50 (the topic of this pre-existing thread).
The video mentions some features that we have never seen discussed before, so we thought we'd add a link to it into this thread so that you can take a look for yourself: