Recently, a video has been posted about a politician named Varoufakis sticking his middle finger to Germany.
Later, a German TV host admitted faking Varoufakis 'middle finger' video on YouTube, showing some smart germans editing it using a software.
As a skeptic person, I'm not sure which one is the real one (statements of authority, videos uploaded do not really make me believe anything).
I only believe in evidence.
How can I know or basically prove (or be 99.999%) sure that a video is faked or staged using a software? What would be the methods or procedures? I would appreciate if a video professional would help me.