In this video, Constantin from Raiffeisen Bank International explains how they integrate AWS Key Management Service (KMS) with Thales key management system running on-premises. The solution uses AWS Step Functions and Lambda to enable internal users to generate keys for use with AWS services across accounts, while maintaining compliance with data security requirements. This approach allows regulated industries like banks to bring their own keys into AWS and manage them from their on-premises environments, providing a secure and flexible key management solution.