After changing the infrastructure and introducing the service worker I guess there is a need to update the readme file in the front-end repository of the VideoCutTool to install and setup the VideoCutTool front-end, back-end and the service workers locally.
Also, needs to be updated in the commons wiki: https://commons.wikimedia.org/wiki/Commons:VideoCutTool
Happy to provide more insights and help to setup the tool if requires :)
Code Repos:
https://gerrit.wikimedia.org/r/#/admin/projects/labs/tools/VideoCutTool
https://gerrit.wikimedia.org/r/#/admin/projects/labs/tools/video-cut-tool-back-end
https://gerrit.wikimedia.org/r/#/admin/projects/labs/tools/video-cut-tool-worker