Run

git config --add oh-my-zsh.hide-status 1
git config --add oh-my-zsh.hide-dirty 1

Need single =, and need variables e.g. $directory in quotes

If you only want, say video.mp4 rather than e.g. /home/myname/long/complicated/path/to/video.mp4, use the basename command.

Similarly, to remove the extension, use the parameter expansion ${filename%.*} (note that the only dot in the file name can then only be the .extension).