Add watermark to s3 video stream

Question

Hy,
I have a s3 bucket containing large video files.
In a nodeJs server, I use Aws.s3.getObject from 'aws-sdk' npm to get the needed file.
I need the response stream to contain a watermark layer that is a part of the file. i need the watermark to be dynamic for each account so it is not an option to store the file with a watermark when I upload it.
when I request the file I don't want any changed to be done on the original file, just edit the response stream.
is it possible to do something like that?
I researched and found that something like that can be done using lamda function but I had a very hard time to find exactly what I need in your documentations.

Ill really appreciate any help to figure that out
Thanks ahead!
Aviv

AWS TAM · Answer

You can use AWS Lambda@Edge to modify and process videos at the CloudFront edge locations as they are being retrieved from S3. This allows adding watermarks dynamically without pre-processing the videos.

The steps involve:

Write a Lambda@Edge function to overlay the watermark on the video stream
    Associate the Lambda function with a CloudFront distribution behavior
    When the video is requested through CloudFront, the function will execute and return the watermarked video stream

https://aws.amazon.com/getting-started/hands-on/amazon-s3-object-lambda-to-dynamically-watermark-images/

Add watermark to s3 video stream

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