Hello Vibhuti,
you can install openmeetings on the same server like moodle is installed. But in an production environment it should be installed on a different server.
Here is a link to an installation instruction for openmeetings:
http://openmeetings.apache.org/installation.html
And here you can find some advice how to install the openmeetings plugin for moodle: http://openmeetings.apache.org/MoodlePlugin.html
Last but not least, at the following site you can find a list with tutorials for installing openmeetings on different types of servers: https://cwiki.apache.org/confluence/display/OPENMEETINGS/Tutorials+for+installing+OpenMeetings+and+Tools
Greetings,
Michael