The first place to start when teaching video production is the essential aesthetics for the format. Though creativity drives the medium, the principles are relatively common. These "rules" can be broken, but only once they are understood as basic ways that the audience relates to the given image.
Begin with image framing, such as different shot types and how the position of a subject communicates to the viewer. Basic principles such as the Z-axis, the rule of thirds, the 180-degree rule, and how to avoid jump cuts should also be beginning lessons. Always impart this information during practical production rather than lectures.
Knowledge on lighting is also crucial, as it sets home videos apart from professional video production. Simple techniques such as three- and four-point lighting are great ways to show students how to make an image pop or create artificial situations that are standard for video production. As video production is not merely the use of visual elements, you should address audio as well. Full sound design is not relevant for most student videos, but a basic understanding of audio mixing, how microphones work and how to get clean sound is important.
You can do all of this as part of exercises in which students produce short video clips that are then critiqued. This will allow the students to stay involved at all levels, including the critical process, and obtain something that they can actually take away from class.