The following ghost video has a shadow, to the right, form and move in and out of frame by the investigator. The video camera was stationary, meaning no one was holding onto it, eliminating the possibility of a finger in front of the light. No one was to the right of the camera, either, where the light from an IR camera is shining. The clip was filmed in a haunted home by Shadow Hunters of Ohio.
The investigator was feeling the presence of the black mist and reacting to it, even though it was unseen (except to the full spectrum camera).