I use FCPX, curious on how I can put a non-360 clip into a 360 video?
It looks like the Dashwood 360 VR plug-ins have a plug-in called Project 2D on Sphere that allows you to put 2D footage into your 360° panorama:


  The Project 2D on Sphere plugin can be used to place logos in your 2:1 equirectangular projection


It has a variety of other useful tools, too.