In YouTube or any other internet content you make money via showing the advertisement. Which is dependent on various factor, few are listed below -
- Number of views of the ad (say you have one ad on each video and you have 5 views of your video then ad views will be 5)
- Number of clicks (each qualified click results in some upwards money)
- Quality of the visitor (if a CEO is visiting your ad have more value then a student)
- Quality of the ad (again depends on lot of factor)
And in short you don't get paid for video rather u gets paid for the ads...