Visually removing the camera support in post production is common when creating an immersive video. It can be distracting to see the tripod, rover, rail or cable supporting the camera in 360 or 180 video. Inevitably there will be stitching artifacts from that support hardware. Observing those set elements in an immersive video is distracting and can break the sense of being present in the story.
For 3D-180 media it's possible to mount the camera so that the tripod and film gear is hidden from the view of the camera, but for 360 there will typically be a visible tripod or other rig holding the camera. Removing this will help fully immerse the audience in the virtual world.
Some productions choose to blur the tripod area or composite a black void or circular logo where the camera sits. This is an acceptable method for productions without the time or resources to paint out or mask out the rigging on every shot. Many high quality immersive video projects employ the black void technique, as it provides the audience a platform to sit or stand upon while watching.
High end immersive video productions traditionally composite clean plate information which was captured during the shoot. Compositing a still frame or a short range of video frames as the nadir plate provides a more natural sense of presence than a blur, void, or logo.
The clean plate can be either a static image or a short sequence of captured video frames of the floor or ground where the rig would have been, with the same lighting as during the shoot. Capturing clean plate information is very important for floors or surfaces with complex details or patterns. As part of the production workflow, the clean plate is composited into the stitched video before any color grading occurs.