Overlay a fetched image over itself (with transfor

I would like to generate an image with to versions of the same fetch image, like this one:

Here are the two versions:

The background: https://res.cloudinary.com/nho/image/fetch/w_1024,h_512,c_thumb,g_auto,q_auto,f_auto/e_brightness:80/e_blur:3000/https://nicolas-hoizey.com/2016/08/a-bridge-not-so-far.jpg

The overlay: https://res.cloudinary.com/nho/image/fetch/w_1024,h_512,c_fit,q_auto,f_auto/https://nicolas-hoizey.com/2016/08/a-bridge-not-so-far.jpg

I don't understand how to do that with the documentation for overlays and for chained transformations.

Cloudinary does not currently support using fetched images for overlay purposes. If the source for these images (e.g. https://nicolas-hoizey.com) is known in advance then automatic-upload may be preferable.

Then, achieving the desired effect is done with the following transformation sequence: http://res.cloudinary.com/demo/image/upload/w_500/u_upload:2016:08:a-bridge-not-so-far,ar_2:1,c_scale,e_blur:2000,o_70,w_0.7,c_crop/h_1.0,fl_relative.layer_apply/2016/08/a-bridge-not-so-far.jpg

UPDATE: Cloudinary just announced a new support for overlaying dynamically fetched images. This is done by encoding the remote URL to Base64, e.g. (rails):

Base64.urlsafe_encode64("https://nicolas-hoizey.com/2016/08/a-bridge-not-so-far.jpg")
 => "aHR0cHM6Ly9uaWNvbGFzLWhvaXpleS5jb20vMjAxNi8wOC9hLWJyaWRnZS1ub3Qtc28tZmFyLmpwZw=="

Then the transformation URL will look something like: https://res.cloudinary.com/demo/image/fetch/w_500/u_fetch:aHR0cHM6Ly9uaWNvbGFzLWhvaXpleS5jb20vMjAxNi8wOC9hLWJyaWRnZS1ub3Qtc28tZmFyLmpwZw==,ar_2:1,c_scale,e_blur:2000,o_70,w_0.7,c_crop/h_1.0,fl_relative.layer_apply/https://nicolas-hoizey.com/2016/08/a-bridge-not-so-far.jpg