The Cloudbreak version used in this video is Cloudbreak 2.7.1.
To obtain the roles that need to be assigned to the service account, refer to https://docs.hortonworks.com/HDPDocuments/Cloudbreak/Cloudbreak-2.7.1/content/gcp-pre/index.html#service-account
If you are using a corporate Google Cloud account you may be unable to perform some of the steps (such as service account creation and role assignment) by yourself and you may have to contact your Google Cloud admin to perform these steps for you.
If you are using a Cloudbreak version different than 2.7.1, refer to the equivalent documentation for that version. You can access Cloudbreak documentation from the Hortonworks docs page at https://docs.hortonworks.com.