Adds a video walk-through

doc/user/infrastructure/index.md

@@ -41,6 +41,15 @@ This template also includes some opinionated decisions, which you can override:
   [run the Terraform commands](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/ci/templates/Terraform/Base.latest.gitlab-ci.yml)
   `init`, `validate`, `plan`, `plan-json`, and `apply`. The `apply` command only runs on `master`.
 
+This video from January 2021 walks you through all the GitLab Terraform integration features:
+
+<div class="video-fallback">
+  See the video: <a href="https://www.youtube.com/watch?v=iGXjUrkkzDI">Terraform with GitLab</a>.
+</div>
+<figure class="video-container">
+  <iframe src="https://www.youtube.com/embed/iGXjUrkkzDI" frameborder="0" allowfullscreen="true"> </iframe>
+</figure>
+
 ## GitLab Managed Terraform state
 
 [Terraform remote backends](https://www.terraform.io/docs/backends/index.html)