The syntax you’re looking for is dv.current().Video, or the normalised variant of dv.current().video. The latter one is lowercasing the field, and replaces space with dashes (if needed). For more information on field names, see Adding Metadata - Dataview
Also note that if you actually want to get the filepath of a link, you’ll need to use either something like dv.current().video.path or in a DQL query something like meta(this.video).path (or meta(file.video).path ). And you then got access to the following parts of the link:
display – The alias, or displayed portion of the link
embed – A boolean indicating whether this is an embed or not
path – The full path of the file including extensions
subpath – The subpath, like when linking to a header or section
type – The type of the link… Most are file, and some are header and block