I’m not sure if this is a question for the “Find a Consultant” forums, maybe it would fit better in this one. But anyway; the separator between username and password should be a colon. There may also be a problem with the @ sign in the username, you may try to replace that with %40, but I’d fix the separator first and see if it works.
I assume you are familiar with putting this URL into a Stream file, then starting the Stream file to connect to the camera. Otherwise, please read this article.