What term may be used when something is being shown in a video format during a trial?

The term "play video" is appropriate in the context of a trial when a video format is being shown. This phrase directly indicates the action of initiating the playback of the video content for the court, jury, or other viewers. In a courtroom setting, this action is critical as it often relates to presenting evidence that can affect the outcome of the trial, allowing the judge and jury to observe evidence in a direct and compelling way.

The other terms, while related, do not convey the act of showing a video as directly. "Video session" could imply a meeting or conference rather than a presentation of evidence, "evidence presentation" is too general and does not specify the format, and "display visual aid" could refer to any type of visual material, not just video. Thus, "play video" specifically captures the act of presenting video evidence in the context of a trial.