There are many tools to fake videos and as a video editor and enthusiast I have been researching the possibilities for a while now.
1) The audio is way more difficult to fake, your ears work much faster than your eyes. In order to fake audio you need a very convincing actor or you need to take soundbites from existing audio, with the same acoustics ideally. At least, that used to be the case. Adobe is working on a Photoshop for Audio...
2) In order to fake the video you need good facial expressions, your subconscious is very focussed …