The Houston Astros use Trackman, MLB Statcast's tech, in order to track the spin rate on their pitches. Spin rate is the number of times a ball spins before reaching home plate. By analyzing the spin rate of their pitches and adjusting how they throw them, they have been able to become better pitchers.
This technology helps teams analyze how the ball is likely to move while it is pitched, and when added to a number of other factors can help make a player better. This technology utilizes three cameras to give a complete analysis of every pitch thrown over the course of every game. Two focus on the area between the pitcher and catcher from the first and third base lines, and the last focuses on the height of the strike zone for the batter. By capturing an image once ever 60th of a second it creates a 3D model of each pitch thrown. This allows teams to see the balls pitch trajectory, release point of the pitch, spin rate, and where in the strike zone the pitch hit.
Lance McCullers specifically used this technology in accordance with the Astros analytics team to model his change up after Felix Hernandez's all time pitch. By adjusting the release point of the pitch and the spin rate, McCullers has been able to develop a one of the games most effective change ups. The Astros coaching staff has taken a similar approach to starting pitcher Collin McHugh's curveball. The analytics team took the high spin rate on this pitch and thought how it could be adjusted to make him better. The coaching staff worked with him on changing his release point to use the spin rate to his advantage and has completely changed the way that he pitches, making him an asset to the Astros. This analytics is a big part of why the Astros made the playoffs last year and has helped them create a great young pitching staff. (Spin rate for McHugh and McCullers versus average MLB can be seen below)
However, there are some problems that can result from changing how a pitcher releases and throws a baseball. By forcing a pitcher to change their methods a pitching, the pitcher may ultimately become worse. This can be seen in the career of Dontrelle Willis, who was forced to change from his unusually high leg kick to a shorter stride, to prevent injury. But he was never as good once his methods changed, which ultimately ended his career in baseball. The problem this could create is over analyzing how a pitcher plays the game, and trying to make something too perfect. By doing this teams make take out a certain human aspect essential to the game.
Link to Astros article: http://ftw.usatoday.com/2016/03/houston-astros-spin-rates-statcast-mccullers-mchugh-keuchel-mlb
Link to Pitch tracking technology article: http://theweek.com/articles/607875/how-technology-making-baseball-better--even-without-robot-umpires