[rhettbull]

https://github.com/RhetTbull/osxphotos will do this:

osxphotos query --min-size 100MB --add-to-album "Big Files"

Finds all photos, videos > 100MB and adds them to the album "Big files"

`osxphotos query --help` for more info or `osxphotos docs` to open docs in the browser.

Disclaimer: I'm the author.