Simply upload a video and ask something like, 'Was this generated using Google AI?' Gemini will scan for the imperceptible SynthID watermark across both the audio and visual tracks and use its own reasoning to return a response that gives you context and specifies which segments contain elements generated using Google AI.
Google is not just blowing smoke-the new image generator is much better. Its grasp of the world and the nuance of language is apparent, producing much more realistic results. Even before this, AI images were getting so good that it could be hard to spot them at a glance. Gone are the days when you could just count fingers to identify AI. Google is making an effort to help identify AI content, though.