@Daniel,
You were true on the side-note, sudo prefixed command for NGinx actions will cause an serious threat. I missed the note...

@Andrew
also stated "In Linux (and most other Unix based systems) ports below 1024 need to be opened using the root user. So you need to start NGINX as root which will open the port and then drop down to an unprivileged user for the port."

Is there a way to achieve this?

I am not sure, if the below is relevant?
http://stackoverflow.com/questions/413807/is-there-a-way-for-non-root-processes-to-bind-to-privileged-ports-1024-on-l