1. A computer-implemented method comprising: receiving a plurality of three-dimensional (3D) track points for a plurality of frames of a video; determining respective colors and sizes to render a plurality of the 3D track points by: determining a respective color to render a respective 3D track point to visually distinguish the respective 3D track point from colors of 3D track points that lie within a threshold distance of the respective 3D track point; and determining a respective size to render the respective 3D track point based on a distance between a camera that captured the video and a location referenced by the respective 3D track point; rendering the plurality of 3D track points according to the determined colors and sizes for a frame of the video on a two-dimensional (2D) display; and receiving input specifying an insertion location among the rendered 3D track points for insertion of a 3D object into the video.