An apparatus comprising means for: identifying, for a plurality of identified frames of a video comprising a first frame and at least one second frame subsequent to the first frame, regions of one or more regions of the first frame that have been viewed and regions of a plurality of regions of the second frame that have been viewed, wherein the respective regions of the respective frame that have been viewed is determined by one of a position of a user's head, a position of a user's eyes or a user input; determining transition probabilities for each of at least one first-frame region of one or more regions of the first frame, wherein the respective transition probability comprises a ratio of a number of viewers that had viewed a respective first-frame region of the first frame and then subsequently viewed a respective second-frame region of the plurality of regions of the second frame to a total number of views of the second frame; based on the transition probabilities, determining path probabilities comprising a path probability for each of at least one of a plurality of paths through at least the first and second frames of the video, wherein a respective path extends through a region from each of at least the first and second frames, wherein the path probability defines a likelihood of the respective path to be followed; and defining a storyline based on at least one of the path probabilities, wherein the storyline comprises a series of a plurality of sequential regions of the video; wherein the storyline is defined to be a path of said plurality of paths having largest path probability and/or a path of said plurality of paths having a path probability exceeding a predefined threshold percentage of the largest path probability. identifying, for a plurality of identified frames of a video comprising a first frame and at least one second frame subsequent to the first frame, regions of one or more regions of the first frame that have been viewed and regions of a plurality of regions of the second frame that have been viewed, wherein the respective regions of the respective frame that have been viewed is determined by one of a position of a user's head, a position of a user's eyes or a user input; determining transition probabilities for each of at least one first-frame region of one or more regions of the first frame, wherein the respective transition probability comprises a ratio of a number of viewers that had viewed a respective first-frame region of the first frame and then subsequently viewed a respective second-frame region of the plurality of regions of the second frame to a total number of views of the second frame; based on the transition probabilities, determining path probabilities comprising a path probability for each of at least one of a plurality of paths through at least the first and second frames of the video, wherein a respective path extends through a region from each of at least the first and second frames, wherein the path probability defines a likelihood of the respective path to be followed; and defining a storyline based on at least one of the path probabilities, wherein the storyline comprises a series of a plurality of sequential regions of the video; wherein the storyline is defined to be a path of said plurality of paths having largest path probability and/or a path of said plurality of paths having a path probability exceeding a predefined threshold percentage of the largest path probability.