Meditation is an aspect of Wing Chun, as most martial art systems. The Sil Lum Tao form is a great example. It is a meditative form as well as a qi gong form that rests the mind and creates harmony within the body.
Wing chun meditation can help restore the body to balance by harmonizing the qi energy within the channels that travel through the body. Meditation can help expand the mind as well as relax it relieving stress and anxiety.
There are many forms and types of meditation. Just as you choose the martial art that is right for you you should choose the type of meditation practice you feel is best for you. This can only be accomplished through education, experimentation and practice.