For measuring the impact, we would be comparing the conversion rate of sessions engaging with Whatmore videos vs those not engaging with the videos.
Create Whatmore Viewers audience in GA4
Give the Audience a name, for example: Whatmore Viewers
Click on Add new condition → Events
Select the event name video_view
Similarly, create an audience to exclude whatmore viewers and name it “Not Whatmore Viewers”
Now, add comparison to any report.