How to use sound input as a trigger?

Hi everyone,I am making an VR game right now,I would love to know how to activate an animation by detected user’s sound input.
For example, when player say"yes",the door inthe game will open.
I am using occulus rift.
Thank you so much!

the forum thread linked below discusses some of this issue maybe it will be of help to you.

https://forums.unrealengine.com/development-discussion/audio/1417247-how-can-i-create-an-microphone-input-in-ue4-help-please

https://github.com/NvRTX/UnrealEngine Here from Nvidia Developers site.