In Dunn v. Bank-Tec S., 134 S.W.3d 315 (Tex. App.--Amarillo 2003, no pet.), the Amarillo Court of Appeals held that the plaintiff could authenticate a surveillance video introduced during his cross-examination by agreeing that he was the person filmed and by "describing the things he was doing in the video." Id. at 329.
The court concluded that Dunn's testimony "effectively supplied the predicate for the video's admission by revealing that its content was an accurate portrayal of the acts he was doing" and affirmed admission of the video. Id.