Facial expressions can be now transferred, from an actor to a photo realistic computer generated human – in real time:
It is just a question of time, before anybody would be able to say: “It wasn’t me”, “I never said that” or “I was imitated by a 3D computer model”.
Live interviews or live recording will probably lose it’s credibility, since anything could be posted as a fake.
This is probably one of the reasons, why block chain will come to shine, where you will be able to “sign” a video of you self, to show this video is authentic. E.g. anyone would be able to make a video of Will Smith, but only Will Smith would be able to sign it with his “block chain signature”.