How to Create a Ghost Effect In-Camera

From RocketJump Film School YouTube Channel:

Here's a quick, cheap way to create a ghost effect, in-camera, without any VFX! Also known as "Pepper's Ghost", this effect has been around for ages, and is still used today. Disneyland's "Haunted Mansion" and the Hogwarts Express at Universal Studios both use this effect, and a modified version is still used in modern tele-prompters.

Materials Needed:

• A dark, low-light scene with 2 light sources
• Large pane of glass (or plexiglass) held up by a stand or clamps
• Black blankets or fabric to hang behind your ghost
• Camera