I wrote a Wowza module called Wowza Wrench which allows you to authenticate your website's users in Wowza by putting generated tokens in your connection url. This enables you to log users on wowza side, perform additional authorization or even set up pay-per minute or pay-per-view solutions.
The tutorial on user authentication is here.
Feel free to give me feedback and suggest improvements. I am actively working in my module and adding new features regularly.