Addressing the widely reported deficiencies in elementary teachers' competence in technology use and in inquiry-based science instruction, we present and assess a novel teaching experiment conducted in a university-school collaboration. Pre-service elementary teachers planned and produced teaching videos in which they gave instructions on experimental work to a class of 11-year-old pupils. Pupils watched the videos, carried out the experiments, and videoed their feedback to the pre-service teachers. In their qualitative and quantitative questionnaire responses, the pre-service teachers (n=130) reported having learnt broadly about physics concepts, experiments, pupils' conceptions and abilities, and the use of ICT in teaching and learning. We discuss the detected benefits, problems and potential of video-mediated instruction of real-life student work in pre-service teacher education.