This situation sounds painful and messy, and I can feel the embarrassment through the words. If a private tape of your husband was shown at your wedding without consent, there are a few legal routes that might be open depending on where you live. Common claims people use include public disclosure of private facts (if the content is personal and not newsworthy), intentional infliction of emotional distress, invasion of privacy, and in many places laws against non-consensual distribution of intimate images — sometimes called revenge porn statutes. Criminal charges may apply if someone knowingly shared sexual content without consent. Whether you or your husband can sue depends heavily on who actually distributed or displayed the tape, whether consent existed at any point, and the local statutes.
Practically speaking, immediate actions matter a lot. If the tape is still being shown, ask the DJ or whoever is running the tech to stop the playback and remove the file. Preserve evidence: get names of witnesses, save copies of the video or program that showed it, take screenshots or record the event in a way that’s lawful where you are, and note timestamps. Consider contacting law enforcement if the clip is intimate and was shared without consent — that may trigger criminal investigation. On the civil side, an order to stop dissemination (injunction or emergency order) and a lawsuit for damages are options; talk to an attorney who handles privacy or family-related torts to see what fits your facts.
I can’t predict outcomes — defenses people use include consent, the material being in the public domain, or newsworthiness — but even if legal action is messy, stopping further spread and getting an immediate cease can prevent more harm. Personally, I’d prioritize safety and emotional care first, then the legal follow-up. It’s awful to have memories like a wedding tarnished, and I hope you can regain control quickly.