http://u19.boys.2017.volleyball.fivb.com/
Almost missed that one. Looks like there is no official streaming but maybe there will be for the knock out phase....
EDIT:
Results/Ranking section on the official site is somehow messed up. Wikipedia got it better:
https://en.wikipedia.org/wiki/…27_U19_World_Championship
Pool B looks interesting. Japan is leading with 3:0, while Poland is already out with 0:3.