Customise an Live Streaming App Template

I need to customise an live streaming app template like some designs etc. and also want to know how i can broadcast my live stream to that app using obs or zoom app with no delay. I am planning to purchase this app template - https://codecanyon.net/item/prime-video-flix-app-movies-shows-live-streaming-tv-web-series-premium-subscription-plan/25735230
if you know regarding this and can create functionality in this app from which i can stream through zoom or any other fast service please bid here.