According to nginx docs, add a line to your configuration file.
access_log /path/to/your/logs/nginx_access.log; error_log /path/to/your/logs/nginx_error.log info;
To log in using the supervisor, you can add lines to your configuration file, like this
[program:program] command=/virtualenv/python /path/to/django/source/manage.py run_gunicorn --log-file /path/to/your/logs/gunicorn.log stdout_logfile=/path/to/your/logs/supervisor.log
As you can see, gunicorn log is specified in the log-file parameter
Finally, in django settings you can do the registration according to docs
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