No, there isn’t. It’s a missing feature and is on the list for a future release. I’m hoping it’s easy to do (off the top of my head, I don’t remember why I didn’t put it in the first place, so there may be some edge case or something like that).
Thanks Nik – always quick to respond! Adding the video filter would definitely be good for a future release if you can. I know other apps that access the Photos library (e.g. de-dup apps) can filter on video.