A Boeing 767 was forced to break off its approach into Hamilton, Ontario (YHM) after the flight crew spotted a glider in its path. The Cargojet flight had flown from Vancouver, British Columbia (YVR), and was tracking the ILS to runway 12 when the incident occurred. The 767 pilots had no indication that the glider was there until they could see it directly in front of them. The pilots banked the aircraft to the right to avoid a collision. They were then able to re-intercept the localizer and make a safe approach and landing at YHM.