World Cup referees get vanishing spray lessons ahead of Brazil

World Cup referees Howard Webb, from England, and German Felix Brych explain the new technologies that will make their debuts in Brazil.

Vanishing spray will be used for the first time at a major international tournament to help with stopping players encroaching at set-pieces.

Goal-line technology will also be used, something that Webb is already familiar with after it was introduced successfully into the Premier League this season.