AWS CodeCommit, a managed source control service by Amazon, can be integrated into a Codefresh pipeline through a series of steps involving AWS Lambda functions. The process begins with setting up a Codefresh pipeline that is not directly tied to a repository, followed by creating AWS Lambda functions to handle HTTP requests using the Codefresh API. This setup includes configuring necessary environment variables such as repository details and authentication keys. The Lambda function is then triggered by changes in the CodeCommit repository, which subsequently initiates the Codefresh pipeline. Upon committing changes to the CodeCommit repository, the configured Lambda function activates, sending an API request to Codefresh to start the build process. The pipeline clones the repository and can be extended to perform various tasks such as building applications, running tests, and deploying updates.