When in lowlight settings, your camera may pick up ghost-like "orbs" when it is recording. Don't worry—there's nothing supernatural going on. These orbs are called backscatter or near-camera reflection. Backscatter happens when dust, water droplets, or other particles are present on or very close to the lens, causing light to reflect through the unfocused images.
If the "orbs" appear to be moving, it is likely dust particles in the air floating by closely to the camera lens. If stationary or persistent, you can get rid of them by carefully cleaning your lens. You can find information on how to properly clean your lens here.