Much better to read the linked Independent piece: http://www.independent.co.uk/news/world/asia/hong-kong-prote...
https://www.youtube.com/watch?v=w4q8fs8gTIs
The live stream has been covering the whole protest and also shows recaps (picture in picture). Jimmy Lai, who has been seen protesting in a poncho and goggles, owns a media empire in Hong Kong, including the Apple Daily newspaper which runs this YouTube channel.
From a tech perspective, they've been running without interruption and they even used a drone, I think a helicopter, to take footage swooping over and around the protestors and police.