Like EPL, Bundesliga is running video assistent trials this season.
For the first part of this season - in 144 matches - 44 clear ref mistakes have been found.
33 of them could have been overruled based on the criteria in place (goals, pens, straight reds and mistaken identity for cards), about 2 decisions per matchday.
Video Assistent Referees (VAR) will be introduced in the Bundesliga from next season, planned for 2018 FIFA WC
and probably for EPL from the season 2018/19.
Will be similar to American Football then and the ref decides when and if he uses VAR.
There are ideas in Germany that it should be similar to tennis, where each team have a certain number of challenges per match.