If your DNS record points to your server IP that’s all it needs from the DNS perspective. Now, your server needs to map those requests to your WordPress website. That’s handled by Apache or Nginx, or whatever other server you may be using.

Your description is confusing. Is it a video hosting platform like YouTube or is it a Python-based app builder?

FreeScout.net is a great, free, and open source option. Takes its inspiration from HelpScout.