Victoria Police are being urged to investigate a collision in Melbourne's CBD involving a cyclist and a man who opened the passenger-side door of a taxi into the rider's path.

The female cyclist was knocked from her bike as she rode along Collins Street on Monday evening.

Footage of the crash has since been posted on YouTube because the woman had a camera attached to her bike handlebars.

In the video, the woman attempts to get the details of the taxi passenger but he and his two companions refuse and walk away.