And actually the definitive answer is in the text of the original video...
Cancelling LEDs.
First introduced on the new BMW 7 Series (July 2012) as part of the optional Adaptive LED Headlights, this functionality is now also supported with Xenon headlights on all new BMW 3 Series Saloon and Touring models specified with a Visibility package.
BMW Adaptive Headlights are combined with BMW High-beam Assistant technology to provide an intelligent headlight system that optimises the illumination of the road ahead without glaring on-coming traffic and other road users. This ensures improved visibility and safety during night time and poor weather driving conditions.