According to the Pace Academic Integrity Code, plagiarism is defined as:
The adoption or reproduction of ideas or words or statements of another person as one’s own without acknowledgment. This would include, for example, copying the answers of another person or copying or substantially restating the published, unpublished, or on-line work of another person without appropriate attribution, or collaborating with another person on an academic endeavor without the prior knowledge
of the instructor or without proper acknowledgment of the other person's contribution.
A creative work -- including an image or a video found online -- is always the intellectual property of someone else. If someone else thought of it, posted it, drew it, or sang it first, it can be used in an academic paper, so long as you attribute the work to the person who originated it.
You must give credit by citing the source within the text of your paper and in a bibliography at the end of your paper.
This research guide includes the most common examples of multimedia citations.