The average cost for developing apps for iPhone ranges between $10-20K for a simple, and goes above $40K for a more complex app. Based on previous experiences, a typical live streaming app will take ~600 hours until somewhat production ready.
It is surely better to start from an existing project (if it's from a reliable source and has most of the required features) instead of paying someone for creating the same. Continuing a well established project also saves at least three months of development time, avoids many unforeseen obstacles and months of testing. With five years of success and over one million downloads, Cameleon offers the most solid start-point for your livestreaming apps and we're offering the years of development, testing, refinements and experience for one, relatively low price of 600 hours.
☛ Less than 0.01% crashes during 2018 & 2019 @AppStore. Latest Xcode, Swift 5.0, clean code, well structured, no mess.