In commercial settings, NVC can be used to gauge how receptive people are during business meetings and presentations. In the context of a team, it can be used to read the thoughts and feelings behind what is being said, and to identify any underlying issues or communication barriers.
For example, when people don't want to participate in a team activity, their body language will become defensive and closed off. They may also avoid eye contact or fold their arms across their body to create a barrier.
With these kinds of non-verbal signals, even if someone is participating orally, you will be able to sense their reluctance.