Its properties are shown only when a plane track is selected. Firstly, the name of the selected plane track is shown. It can also be changed from here.
- Auto Keyframe
Toggles the auto-keyframing for corners of the plane track. With this enabled, keyframes will automatically get inserted when any corner is moved.
Field to select or create an image which will be displayed inside the plane track. This image is for preview purposes in the Movie Clip editor only. To include it in your final render, see Plane Track Deform node.
Used to set the opacity of this image. Again, this is for display purposes only, and will not affect your final render.