Screen Recording in Classroom

Again, I'm not in the classroom but am working toward a secondary education degree. Still, two immediate ideas that come to mind are using screen recording as a way to capture (and then to make available for student viewing on a wiki or moodle) any PowerPoint presentations I give. A second thought is that those same screen recorded PowerPoints could be re-presented with greater depth of information or further elaboration upon topics of student interest. I think this is a decent idea since some students are going to want more, rather then less, information in order to feel challenged or engaged. In fact, I could simply ask students, or learn from informal observation, what topics they would like to learn more about, and if class time or curricula pressures don't allow further exploration, I could create relevant PowerPoints, screen record them, and post them for student viewing. This sounds like a good way for me to expand my content knowledge as a teacher, and perhaps a good way to build rapport with students.