OpenPIV with GPU supported acceleration is available
Both the software that you can try in a Google Cloud sandbox Jupyter notebook, or fork and change and use, and a corresponding paper are out.
Dallas CA, Wu M, Chou VP, Liberzon A, Sullivan PE. GPU Accelerated Open Source Particle Image Velocimetry Software for High Performance Computing Systems. ASME. J. Fluids Eng. 2019;():. doi:10.1115/1.4043422.