In the last few days both The Guardian and The Independent have reported on trials of teachers wearing body worn cameras in UK schools. It is obviously early days but it does have potential Data Protection and Information Security ramifications. You may wish to read the articles, which contain comments from both the Information Commissioner's Office and the Department for Education:
https://www.theguardian.com/education/2017/feb/08/two-uk-schools-trial-use-of-police-style-bodycams-for-teachers
http://www.independent.co.uk/news/education/education-news/teachers-wear-body-cameras-record-pupils-bad-beaviour-video-trial-education-schools-a7568646.html