Hello rileygdev,
There are two buttons in the Matinee editor window at the top right by default. One is "Movie’ which allows you to render out your Matinee as a movie using a director camera. There are other options within this feature as well which allow you to do an image to image render as well as a .avi video file with a specific set frame rate.
What you will want to do is start your camera matinee on level begin so that it’s not recording any actual gameplay.
The other button, “Record”, can be used to record using a free moving camera. This will create a new Camera Group and Track in your matinee. Here is also a great forum post on the related issue/topic.
Cinematic Rendering using Matinee
Hope this helped solve your issue!
Thanks,