向没有AWS账户的用户授予对AWS S3存储桶/文件夹的访问权限

I want to make a Video On Demand service using AWS S3 , and I would like to restrict each of my clients to his own bucket/folder (which one schema is best..) . I want a client to have access only to his bucket/folder, but these people are not going to have an AWS account.I want to make a Video On Demand service using