How to create a button in Tinymce's media plugin?

Question

JavaScript

How to create a button in the modal window of the model plugin of the Tinymce editor?
Many sources show how to create a plugin and after a button, as well as everything on the Wordpress platform. I do not work with CMS, this editor is installed on the current site. Task: in the insert/edit medial(Video upload) modal place the image upload button.
Please help me implement this button.