OBS plugin to capture and process aync audio stream c++ developer

We need to write a simple OBS plugin that will fork the audio stream and send it to a transcription function using windows SAPI api (local windows function not cloud stuff). we will then process the text from the audio by hashing it - the hash is a non cryptographic hash - xxHash. Our goal is to be able to have a hash stream of the spoken audio. I have a small poc codebase in c# for the audio processing but with the obs plugin this likely needs to be redone so we can stay in c++

let me know initial questions to get moving on this asap.