Flipgrid makes recording video easy for students and teachers as it works in the browser (no need to install software) – you just need a camera. Thankfully, it’s free for educators now that Microsoft have bought it.
Teachers can record video to introduce a topic or ask a question, and students can create their own video responses to share with the class.
Whilst it’s mainly aimed at schools in the US (and you’ll find a lot of the materials are of that type, it can be adapted for use with any group. There are lots of ideas on how to use it here.