Some people put the keywords in a separate csv file that they upload and the agency matches the keywords in this text file with the video, and others add the description and keywords directly on the site. There is no way, as far as I know, to get them into the video file itself, although I suspect (haven't tried it yet) that Stock Submitter allows you to do that.

I reviewed my latest experiences with this great application on my blog earlier in the week. http://www.backyardsilver.com/2017/02/stock-submitter-istock-esp-new-alamy-supertags/

Steve

I use Bridge

How do the keywords get incorporated into a video file format like .mov?

I do everything with Lightroom, would be totally lost without it.
You add all the rendered video files to the catalog, then you handle them in exactly the same way as photos

How do the keywords get incorporated into a video file format like .mov?

Adobe use the Extensible Metadata Platform (XMP) an ISO standard, originally created by Adobe Systems Inc., for the creation, processing and interchange of standardized and custom metadata for digital documents and data sets including photos,video...