Presentation slides (PowerPoint etc) you create:
List your sources in a slide at the end of the PowerPoint presentation, with in-text citations throughout your presentation as applicable. You could also provide a print copy of the sources you used to those attending your presentation.
APA PowerPoint Presentation example by Krystyna Nowak
List your sources in a credits screen at the end of the video.
If possible list your sources at the bottom or side of the image (example). Otherwise, include a list of citations alongside the image where ever it’s uploaded (e.g., Flickr, eLearn).
If you don't receive specific instructions from your instructor, try to include your citations in a way that doesn't impact the design of your digital assignment.