...
For VCU related limitations please refer: PetaLinux 2021.2 - Product Update Release Notes and Known Issuesand PG252 [TO DO: To be updated by 27th October,2021].
For VCU related known issues please refer AR# 76600: LogiCORE H.264/H.265 Video Codec Unit (VCU) - Release Notes and Known Issues and Xilinx Zynq UltraScale+ MPSoC Video Codec Unit.
...