Google "deepfakes"
Caution: You may see porn in the search results.
Anyway... an AI-assisted method of creating completely fake video of people doing stuff, using a mix of bodies from one video and faces from another.
Btw, utilities to do this with voice (AI learning the characteristics of someone's voice and speech mannerisms, then constructing 'that voice' saying whatever you script it to) have existed for a few years now.
You can't rely on audio to be the truth, and now not even video.