i would to create two differents custom media folder templates in the Sitecore 8 media gallery:
- Images Folder
- Videos Folder
When clicking the upload files button, the first will accept only images, the second will be accept only videos. Which is the best way to do this?
There is a market place module for that, it's called Media Library Policeman.
Does exactly what you need.
You can download it here: https://marketplace.sitecore.net/en/Modules/Media_Library_Policeman.aspx