The video above is the The Witcher 3 Wild Hunt Kaer Morhen Main Quest Walkthrough and shows how to complete Kaer Morhen, the quest featured in The Witcher III: Wild Hunt.
The video walkthrough covers the following objectives:
Use your Witcher Senses to find the key of the bedroom door.
Go to the lower level.
Join Ciri in a run along the ramparts down to the Lower Courtyard. Draw your sword.
Aim at Vesemir and mark him as your target.
Perform a series of fast attacks (3).
Perform a series of strong attacks (3).
Perform a series of dodges (3).
Roll out of the way of Vesemir’s blow (2).
Perform a series of parries (3).
Perform a series of counterattacks (3)