Add link to Requirements Walkthrough video to docs

doc/user/project/requirements/index.md

@@ -23,6 +23,10 @@ When a feature is no longer necessary, you can [archive the related requirement]
 <i class="fa fa-youtube-play youtube" aria-hidden="true"></i>
 For an overview, see [GitLab 12.10 Introduces Requirements Management](https://www.youtube.com/watch?v=uSS7oUNSEoU).
 
+<i class="fa fa-youtube-play youtube" aria-hidden="true"></i>
+For a more in-depth walkthrough using a [demonstration project](https://gitlab.com/gitlab-org/requiremeents-mgmt),
+see [GitLab Requirements Traceability Walkthrough](https://youtu.be/VIiuTQYFVa0) (Feb 2021).
+
 ![requirements list view](img/requirements_list_v13_5.png)
 
 ## Create a requirement