To tackle global warming, the reduction of greenhouse gas leaks is of great public interest. While state-of-the-art OGI cameras can visualize larger gas leaks in the magnitudes of liter-per-minute in case of methane, a much more sensitive laser-based approach is introduced here. This is accomplished using an infrared camera in combination with an interband cascade laser (ICL) as active illumination. The laser beam diverges such that it covers roughly half of the cameras field of view. Three-image-batches are recorded to perform classic direct absorption spectroscopy (DAS) on an image scale. The obtained concentration length in ppm*m is validated by measurements with varying known methane concentrations, on different reflective elements and applying varying distances. The real-time camera was able to record and quantify a methane leak as low as 40 ml/min. Possible wrong information due to moving objects are taken into account by an adapted frame-difference approach.