Ask HN: Best tech stack / architecture to create an MVP that records live video?

Hello HN!

So I want to create an app that as soon as you open it, it starts recording video and uploading it to a server simultaneously. It shouldn't wait for the recording to finish to start the upload.

Also if the phone is turned off or the app is closed in the middle of the recording the part of the video uploaded to the server should still be watchable.

What would be ideal: The video recording continues even though you close the app

The app simulates the phone turning off but it keeps it on and recording when you try to turn it off.

Why do I have all these requirements? I had last night a slight episode where the police didn't behave as expected. I'd like to create a new app that instantly records everything the police is doing as soon as you tell it. And also if the policeman grabs your phone he shouldnt be able to stop the recording.

I don't live in the US or Russia, so here the laws regarding the police are quite different that what you might expect, and sometimes you need this kind of defensive apps.

I know there are already made solutions but I want to make my own as a way of practicing.

I have coding skills with web technologies like angularjs and nodejs.

Is that good enough for this kind of purpose (doing a PWA lets say)? or should I go native?

Do you think something like sockets is fast/robust enough for this task?

If not, what do you recommend?