What would you like done?
Change the player type so that it supports thumbnails, autoplay.
Setup uploader to set watermark with username, change audio, etc.
Overall, turn Mux Player and uploader into a plugin that brings videos to Discourse in a similar UI to the ones used to social media platforms.
When do you need it done?
ASAP
What is your budget, in $ USD that you can offer for this task?
Budget up to discussion