According to Adobe
Is AEM Assets available as a separate Package? No. To ease installation and deployment, all AEM Applications and add-ons are delivered in one single package with all functionality included. This does not imply that you have permission to use all features in the package.
How can I prevent my users from using AEM Assets if I did not license AEM Assets? You can remove all AEM Assets-specific workflows, components, taxonomies, options and the AEM Assets admin from AEM. Doing so prevents your users from accidentally using AEM Assets features that you did not license.
https://helpx.adobe.com/experience-manager/6-4/assets/using/medialibrary.html
Are there any packages available for this? If not, is there straightforward outline of this procedure?