Brahman is considered the absolute reality, the true nature of things, and Brahma, you could view as an aspect of it. It is one god as part of this true nature of things. In fact, everything you see on this video, in fact, everything you see in reality, all of these gods, to a Hindu, could be considered as just aspects of the true god or the true reality of Brahman. Now, what's interesting in Hinduism is that gods are not viewed to have a strict gender. For example, Vishnu has a female incarnation, and there's also groups of Hindus who view god as taking a fundamentally female form. One group are known as the followers of Shaktism. To Shaktism, god is female, the supreme goddess, and takes many forms.