AWS video on demand severless arhitecture

I am a AWS Re/start grad and have been thrown into the deep end of a role at a startup company. I need someone to guide me through the following task that I have been assigned. We currently use Elastic Transcoder but will be migrating to Mediaconvert.

Task1.

Implement this architecture below running the cloudformation template.

https://aws.amazon.com/solutions/implementations/video-on-demand-on-aws/