How do I loop a video on Apple TV 4?

I found the answer to my question!

Here's how to make a video loop on Apple TV 4:

1. Add the video to your iTunes Library: File→Add to Library

2. Right-click on the video in iTunes and select Get Info.

3. Click on the Options tab. Next to Media Kind select Music Video. Click OK.

4. On the left side of iTunes find Music Videos and click on it. Double-click the video to play it. Find Controls in the Menu Bar and scroll down to Repeat, then select One.

5. In iTunes at the top, next to the the volume slider you will see a rectangle with a triangle at the bottom. Click on this icon and select Apple TV.

The video will play and loop through Apple TV!