1. A method for processing a 2-D video data set, which comprises a sequence of original 2-D images providing a 2-D representation of a scene, into a modified 3-D video data set which, in addition to the sequence of original 2-D images, comprises virtual 2-D images derived therefrom in one or more data processing units, wherein: an SfM analysis is carried out for each of the original 2-D images and a respectively assigned original position of a recording device which was used to record the original 2-D image, virtual positions are formed for a recording device for recording virtual 2-D images, for each virtual position of the recording device with the associated virtual initial image, a respective assignment is created to at least one of the original positions of the recording device with the associated original 2-D image, for each assignment, a homography is determined between the virtual initial image and the associated original 2-D image, for each virtual initial image, a virtual 2-D final image is formed from the associated original 2-D image in that the original 2-D image is formed into the associated 2-D final image using the respectively determined homography; and a modified 3-D video data set is provided, the modified 3-D video data set comprising pairs of images, each pair of images having an original 2-D image and an associated 2-D final image, thereby forming a 3-D stereoscopic final image, wherein the modified 3-D video data set provides a 3-D representation of the scene.