Cross account ecs fargate blue/green deploy from code pipeline

Hello Piyush,

You can follow below document to use resources created or managed by another AWS account.

https://docs.aws.amazon.com/codepipeline/latest/userguide/pipelines-create-cross-account.html

Additionally, you can also refer to following AWS Blog which explain about building a Cross-Region/Cross-Account Code Deployment Solution using AWS CodeDeploy and AWS CodePipeline.

https://aws.amazon.com/blogs/devops/building-a-cross-regioncross-account-code-deployment-solution-on-aws/

Hope above documents will help you to achieve your use-case.