Due to being in pre-Alpha, what you're seeing are many of the gameplay aspects still very early in the development process.
Shown to the press during gamescom 2016 last week, the video demonstrates how the narrative directly ties to the gameplay. As you will see, the video starts a little after the beginning of the game, as protagonist Dr Jonathan Reid becomes aware that he is a vampire.
You also get a look at some of the characters in the game, dialogue options, player journal and other systems.
As Reid investigates the people of London, he is able to see and determine the quality of blood coursing through their bodies. This will help the player decide whether to drain a "terrible person who deserves to die" despite poor quality blood or someone with the "purest blood" who does not deserve to die.
The latter will earn the player more experience points, but every choice will have a butterfly effect on the game world as every NPC killed affects the city and the people around them. Kill too many, and a district's infrastructure could collapse and turn into disarray.
Vampyr is slated for release on PC, PlayStation 4 and Xbox One in 2017.