Organize image and video files by creation date with exiftool

I use a simple bash script /usr/local/bin/move-cam-files.sh to let exiftool move photos and videos from our camera to directories on our file server, based on creation date as per media file metadata:

#! /bin/bash -x

move() {
  exiftool -r -v -ext $2 '-directory<DateTimeOriginal' \
           -d "/home/storage/$3/%Y/%m" "$1"
}

# directory where to read media files from is $1
# if unspecified use current directory
dir=${1:-.}

move $dir AVI videos
move $dir JPG photos