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If I wanted to pull in a 2D texture to use as a background, how and where would be the best place to incorporate it within 3D+Kn2 raytracer?

Let's say I have a 1920x1080 background and I want it displayed 1-to-1 pixel-to-pixel underneath the content from the raytracer (say buffer/viewport size matches)? Is there any way to use a bitmap 'as is', pixel per pixel in the buffer?

I guess I'd need to integrate it somewhere in the #vertex section?

Thanks!

I check the examples and tutorials, but just wasn't sure how to get a 2d texture behind the content. Already solved that at least roughly.
Now I got another problem that I believe is not possible to solve within what's currently available in frag.

I have implemented a workflow that allows me to track the live camera externally and put it into fragmentarium.
For some reason I am still having some camera mismatches so I wanted to pull in the background plates into frag for reference (if not rendering) to troubleshoot (if not use it for rendering finals).

So I need to dynamically load a texture based on the current frame number.
I have a sequence of bitmaps named "img000.jpg - img999.jpg" and I want to use a picture corresponding to current frame of the animation.
I understand I can only load texture via UI file widget, which won't allow me to modify anything on the fly nor will it accept any parametrization? If so, that does not look doable

Am I right?

Would be a great thing to have! Many thanks!