Wang Qian, a Beijing movie fan, finds herself in a fantasy world when she wears a headset to watch a trailer of the animation film Big Fish Begonia.

"I felt I was really walking in a different world. A number of big whales were swimming toward me ... It's incredibly breathtaking," she says.

Big Fish Begonia, a feature produced by entertainment giant Enlight Media, is among a few Chinese-language movies that use virtual reality technology to make promotional material.