Running in CPU processing, in Editor on Windows, Unity 2021.3.5f1 and MediaPipeUnityPlugin 0.10.0
Prebuilt package and samples from with https://github.com/homuler/MediaPipeUnityPlugin https://github.com/homuler/MediaPipeUnityPlugin/releases/tag/v0.10.1 (Run over pre-built packages at https://github.com/homuler/MediaPipeUnityPlugin/releases/download/v0.10.1/com.github.homuler.mediapipe-0.10.1.tgz)
Thanks to @homuler (https://github.com/homuler) and @vimalmollyn (https://github.com/VimalMollyn) for help.