The thing is, that your dashcam usually stays on public property / public spaces, while a bodycam could easily film someone on private property. Therefore OP would likely have limitations on where they are allowed to film, similarly to an IRL streamer.
You might try something from the lego mindstorms series, tho it might be too early for the child. It allows you to program your creation from both the device itself, as well as from a pc or tablet.
The thing is, that your dashcam usually stays on public property / public spaces, while a bodycam could easily film someone on private property. Therefore OP would likely have limitations on where they are allowed to film, similarly to an IRL streamer.