Currently, Microsoft Stream has the ability to track view events. As for the deeper analytics, we currently do not have deeper analytics on a per video level.
We will be eventually be adding a trend of views/vistors overtime along with a drop off chart showing which part of a video people watched (and didn't watch). This first pass will be to match what we have already in O365 Video so we can sooner transition customers from O365 Video to Stream.
For "Who viewed the video" we hear this quite often but aren't working on it yet. When we pick up this project in the future we'll have to be careful on how we build it and what we expose. There are some restrictions in EU work council's on what can be tracked about individuals.