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Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Word Detection Free.
Word Detection v1.11
Assign verbal commands to your gameplay for all the Unity target platforms. Control your game characters just by talking. Word Detection works independent from a network connection. Add new verbal commands at runtime. Word detection can be used to control Mechanim animations, media clips, and to override the Character Controller input.
Try the [online demos]. Many examples for various uses are included in the package.
[Video Playlist]
[Character Controller] [Media Clips] [Talking Head]
[Mechanim]
[Documentation] is also available online.