The Cloudbreak version used in this video is Cloudbreak 2.7.1.
To obtain the policy that need to be assigned to the user, refer to Create CredentialRole documentation.
If you are using a corporate AWS account you may be unable to perform some of the steps (such as user creation and policy assignment) by yourself and you may have to contact your AWS 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.