Here is a simple tutorial on how to fix “Failure to Play Movie” & “No Cutscenes” Issue in Nioh 2
How to Fix “Failure to Play Movie” Issue
All you need to do is turn off Antialiasing in Nvidia Control Panel.
Nvidia Control Panel > 3D Settings > Manage 3D Settings > Programm settings, select nioh 2 > Antialiasing – mode > Off

Nvidia Control Panel > 3D Settings > Manage 3D Settings > Programm settings, select nioh 2 > Antialiasing – mode > Off

Credit to noided