Head over to Amazon to pickup one of these cool little cameras:

https://amzn.to/47k56hv

In this video I demonstrate the installation and review of the F7ZPlus dash cam on my Lexus GS.
It has a front and rear camera and built in GPS so location and speed data is also stored with the recording. It's powered by either a hardwire kit or a 12V adapter, and uses built in wifi to connect to your phone to review and download footage.