Design a rough model of the scene with the dimensions and shapes which
are important (so that the povray-created objects can go behind them
etc). The apply the video image as an image map to the entire scene
(and with an ambient of 1) so that when viewed from the camera you
can't see any difference between the original still image and the
scene rendered with this image map.

  The additional objects will cast shadows onto this scene, which may
actually be a good thing. (However, if you want them to not to cast
shadows onto the scene, then you can probably remove them by using
light groups.)

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -

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