For any commercial projects including corporate videos, feature films, tv shows, music videos, etc. you should complete the form on the Release Form Request Page to ensure proper paperwork for a use of the stock footage is in place for your project. This still does not involve payment or fees, just making sure all of the legal things are arranged. However, Mitch Martinez is under no obligation to grant stock footage licensing and reserves the right to deny licensing if deemed appropriate.
Many of the clips have already been used for commercial projects of major brands such as Microsoft, Nike, HBO, NBC Universal, Samsung and many others. If you are interested you may want to take a look at Mitch Martinez Official Website.