See my presentation at EELive? If so you can download the slides from:
http://www.newae.com/files/ThinkFastFPGADesignUsing_OFlynn.pdf
And the ISE + Vivado HLS Project from:
http://www.newae.com/files/ThinkFast_FPGA_Files.zip.
You can also check out additional details at the Programmable Logic in Practice post, which includes videos + examples of other uses of HLS.