Is there a way to add watermark to all videos in Google Drive’s folder?
I found similar service, but it works only with pictures, pdfs - Wappwolf
Maybe, it's possible to do by Google Apps Script or some other services (like ffmpeg)?
its stored in drive, but there is no google api that does that with a drive file. In particular for images in drive you cannot change anything except its drive metadata/title unless you reupload new data yourself.