The getGroupById:success:failure returns details of a group. Details include groupId, name, type, groupMembers. Any existing member of the group can retrieve details of the group, including the list of all the group members.
Method parameters :
groupId : Group Id of the Group.
success : Success block to be executed after group details are successfully retrieved.
failure : Failure block to be executed if group details could not be retrieved, returns BayunError.