In this video, I have explained how to use reach planner to forecast the reach and frequency of video campaigns.
You need to contact Google support team to get access to Reach Planner.
Reach Planner shows reach and frequency estimates, but doesn’t guarantee performance. Actual campaign performance depends on other factors (such as ad quality, ad relevance, and campaign settings).
Advertisers can choose budget, location, demographics, devices, time period, ad frequency, youtube ad formats and Google audiences to get reach and frequency forecast.