The amount of money you can earn with video ads depends on multiple critical factors, such as the type of video ads served (in-stream or out-stream), the format of each ad, which ad network you selected, and what payment models they offer.
Natural market fluctuations, such as trends and changing viewer interests, can also significantly affect ad revenue. The best way to estimate how much money you can expect from an ad campaign is to use your ad network’s analytics functions and read the values provided there.