eh? (I'm not sure why you have asked that question)
I assume that you found your video file, so the parent folder is the one where your file is stored.
If you Get Info on your video file, it will show the path up from the file, next to Where: Last item in the path is the parent folder.
There's no standard way to find out what the parent folder might be, before finding the file that you are looking for, unless it is a common folder that you might use for all your video files.