Optical tracking systems (OTS): these may include the use of various cameras, focusing on the field of play, to track all players, the referees and the ball. In some cases, these are governed and supplied by the governing body of the competition(s). In some cases, they might be installed by the team(s) using the stadium.
Some teams and competitions provide team analyst positions with workstations within the stadium to allow monitoring of player and team performance using programme feeds and other data.
Further information on the application of football technology can be found on FIFA.com.