How to get camera settings from video file shot with Nikon D3300 DSLR?
You can extract all the available metadata using a free Exif Tool which you can read about here. You need to bear in mind that you're less likely to extract as much Exif data from video as you are with photo.

This is due to things like ISO, shutter and aperture changing all the time during the recording of video, and therefore is not logged to a specific value/setting like it is with photo. However, you're likely to find just about all you're able to using this tool (and many of the others just like it).

A highly recommended tool known for extracting more data than others is Exif Tool by Phil Harvey