Hi Hari,
Adding the users to the group is done by the Directory Server (LDAP) so
it's separate from the oVirt system.
You could have it done by the same program/script your using to add users/groups to the
oVirt system but it would be an ldap call to the Directory Server.
https://www.python-ldap.org/en/latest/
http://ovirt.github.io/ovirt-engine-api-model/4.2/#services/groups
https://github.com/oVirt/ovirt-engine-sdk/blob/master/sdk/examples/add_gr...
Regards,
Paul S.