This is just a quick 10 minute mock up and needs refinement but I would be looking at something like this:
(View on codepen to see full effect)
It assumes that the video height is the controlling factor in the height of all 3 blocks and that the video should scale and maintain its intrinsic aspect ratio also.
Its not meant to be the one and only solution but a starting point for discussion and refinement
Obviously @coothead 's concerns with wordpress etc need to be taken into account as I have ignored any extraneous code from the demo.