You want to use Django auth failures to generate fail2ban bans to protect against brute-forcing of your passwords. Nothing on django packages... So, you: wrap your login handler with a decorator that logs out messages on failures...

def log_login_failures( function ):
    auth_log = logging.getLogger( 'django.auth' )
    @wraps(function)
    def wrapped( request, *args, **named ):
        result = function( request, *args, **named )
        if request.method == 'POST' and result.status_code != 302:
            auth_log.error( 
                "Login Fail %r by %s",
                request.POST.get( 'username' ),
                request.META.get('REMOTE_ADDR'),
            )
        return result 
    return wrapped

Then you configure your logging to send those messages to a specific log...

LOGGING = {
    'version': 1,
    ...
    'formatters': {
        ...
        'auth': {
            'class': 'logging.Formatter',
            'format': '%(created)s|%(levelname)s|%(message)s',
        }
    },
    'handlers': {
        ...
        'auth': {
            'level': 'INFO',
            'class': 'logging.handlers.RotatingFileHandler',
            'maxBytes': 2*1024*1024,
            'backupCount': 1,
            'formatter': 'auth',
            'filename': AUTH_LOG_FILE,
        },
    },
    'loggers': {
        ...
        'django.auth': {
            'handlers': ['auth'],
            'level': 'INFO',
            'propagate': False,
        },
    }
}

Add a filter to /etc/fail2ban/filters.d/django-auth.conf

[Definition]

daemon = gunicorn_django
failregex = Login Fail.*by <HOST>

And add a scanner to your /etc/fail2ban/jail.local

[django-auth]
enabled = true 
logpath = /var/blog/log/django-auth.log
filter = django-auth
action = iptables-allports

And then you think... where is the pre-built app for this? Surely this can't be something that gets rebuilt by every single Django + Fail2ban user?