You want to present your art work in a format that is professional and easy to view. The specific college or business may specify criteria regarding format but if not , it also depends on if you are mailing it or meeting the prospective client/organization in person. A portfolio I had to send for a college application included photographs and slides of my 3 dimensional work. Usually one photo of each piece is sufficient but two photos of a piece is appropriate if one view does not adequately represent the work. You can purchase portfolio books at an art store and they usually contain clear plastic sleeves to hold the photos or your work. If you work in various mediums , have examples of each to show your skill set in each medium. If presenting in person, a small anecdote or story about your work adds interest and a narrative to help the viewer understand and know you better. For video/graphic content that you mentioned, I would have a story line with the visuals if frame text is not included. A few sentences to explain your objective and intent with the storyline. When meeting with a prospective employer, have a set of goals or narrative ready to share about yourself so the interviewer gets a sense of your skill set, commitment to the field, professionalism and motivation for working with them. Good luck.