2D morphing video images I'm trying to morph from one video to another. I've seen some tutorial of how to morph images subdividing the plane and moving vertices, but what I really want is to morph from 2D moving images (video) sequence.
Does anyone know of any add-on/pluggin that I can use to accomplish this?

I was thinking about placing a feature request, since I think that the tracking system can be used to greatly automate this task. Does anyone know the right place to do this? Do you think it is an interesting feature to ask for?

I know there are programs that can be used to accomplish this task outside blender. I'm using gtkmorph to do the task, but AFAIK I have to morph from still images, and morphing a video sequence becomes very time consuming.
Try image sequence import addon. This makes animated images appear on plane. See this video link here. 
https://m.youtube.com/watch?v=3UOywRFIpLM&amp;feature=youtu.be 

Updated addon link: https://github.com/vicentecarro/ImageSequenceAsPlanes 

First create image sequence from a video clip. With that addon, import Image sequence and all animated images appear on plane. Subdivide the plane like a lattice. Alternatively use a knife to divide plane's face. When you move vertrice or reshape the plane, the animated image distorts, useful for morphing your way. Hope that helps. 

If unsatisfied, try DragonBones, a free open source software.