Is there an example using AXI with HLS on the PL and transferring data from the PS?

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This should be good enough:Allocate — Python productivity for Zynq (Pynq)

The above doc explains how ot use the API. For the complete example, either use Cathal’s example, or something like: https://github.com/Xilinx/PYNQ-HelloWorld/blob/master/boards/Pynq-Z1/resizer/notebooks/resizer_PL.ipynb

You just have to replace the xlnk calls;

xlnk = Xlnk()
in_buffer = xlnk.cma_array(shape=(old_height, old_width, 3), 
                           dtype=np.uint8, cacheable=1)
out_buffer = xlnk.cma_array(shape=(new_height, new_width, 3), 
                            dtype=np.uint8, cacheable=1)

to the API mentioned at the beginning.