You cannot view an SBS video correctly with the naked eye on a standard monitor; it will simply look like two identical videos playing side-by-side. You need specific hardware to decode the depth.
Your VR headset or 3D player takes these two images, stretches them, and overlays them, allowing your brain to merge them into a single, three-dimensional picture. HSBS vs. FSBS: You will often see two acronyms: Online 3d Sbs Movies-