According to the Gravity Forms + Custom Post Types add-on readme file, it has support for custom taxonomies. In your video I’m not seeing any field set to custom taxonomies, maybe the following tutorial can point you into the right direction: https://www.wpbeginner.com/plugins/adding-user-submitted-content-in-custom-post-types-with-gravity-forms/
If not, I would recommend you to contact with the author of the Gravity Forms + Custom Post Types for further assistance.
Said that, if you’re comfortable creating your own custom functions or your have a developer at hand to do it for you, the following filter can be used to change the post type, saving standard fields as taxonomies, etc… https://docs.gravityforms.com/gform_post_data/