Merge branch 'docs/migrate_from_github_to_gitlab' into 'master'

Add link to import video

See merge request gitlab-org/gitlab-ce!29525

doc/user/project/import/github.md

@@ -60,6 +60,8 @@ For additional technical details, you can refer to the
 [GitHub Importer](../../../development/github_importer.md "Working with the GitHub importer")
 developer documentation.
 
+For an overview of the import process, see the video [Migrating from GitHub to GitLab](https://youtu.be/VYOXuOg9tQI).
+
 ## Import your GitHub repository into GitLab
 
 ### Using the GitHub integration