For posterity, the accepted answer (the youtube video) does not actually:
Instead it uses the autogenerated HTML and controllers from phx_gen_auth and shows how to integrate that with a LiveView page. It does not solve the problem of having, e.g. registration form in a live view.
I briefly mentioned my own approach to a similar problem here: Phx_gen_auth using live view ONLY
If anyone wants more details on it, let me know.
