Not really, .....
NX-OS appears not to support groups, except the build in ones admin, network-operator
I don't think you can associate snmp v3 with an ACL
For the rest you can work your way through the commands using the ? to see what options are available.
this will work:
snmp-server user NMS network-operator auth md5 a1b2c3 priv aes-128 d4e5f6
this will give you read access, group admin gives read-write
Cheers,
Michel