GVRP is used for propagation of VLAN configuration information. With a single switch, there is nothing to propagate - all the configuration would have to be done by hand. To see GVRP in action, you would need at least two switches. Then you would hand-configure the VLAN membership for the ports connected to end-stations and GVRP would correctly determine the VLAN membership for the switch-to-switch link.
Anoop