Jurors were shown photos of injuries Holley said he suffered, including a gash on the right side of his face and a bloodshot right eye.
A community activist released the video, prompting fierce public criticism of the police department. Leaders in Houston's black community said they believed the alleged beating was another example of police brutality against blacks and other minorities in the city, and that the misdemeanor charges against the former officers were not serious enough.
Holley was convicted of burglary in juvenile court in October 2010. He was put on probation, which ended last month.
DeGuerin, said Holley is a gang member -- an allegation Holley denied.
If convicted, Blomberg could be sentenced to up to a year in prison.