I've searched unsuccessfully for a pin transform addon for blender. If you've ever used pftrack or syntheyes you know how incredibly useful this tool is for tracking. But it also has applications in VFX, camera projection, sculpting from reference, etc. Here's an example of what I mean: https://youtu.be/M6Mr1IoNa24?t=2m48s
Has anyone ever seen this type of thing, or for those who know how to code, considered making one for blender?