Greetings,
Just FYI (because it can also be found on the conference page: https://nips.cc/) and in case you missed it, this year the videos are not on the Facebook page but here:
https://slideslive.com/neurips/
In addition, brief paper overview videos are now linked on the website:
https://nips.cc/Conferences/2019/Videos
The conference started on the 8th of December ( Expo (Industry) Day on the 8th). The talks started on the 9th, and the tutorials among other things are already online.