This method utilizes media that consists of a pair of side-by-side offset frames (for video) or images. You do not need any special device to view this media, you only need to adjust the focus of your binocular vision so that the images from both sides overlap with each other.
In order to overlap the paired frames, or images, and sense the depth of the media, you may employ your bare eyes with the Parallel Viewing technique.
You may need to practice in order to learn how to use this viewing technique: