Mobile, Tablet, iMac, Mac Air cohesive testing and recording

I would like to know if there is a tool to do the following:

-preview tablet, mobile, iMac, Mac Air on my iMac in the browser.

• record the test and save the video for all four devices, simataously.

This is for a portfolio show following graduation. I want to show how my websites / apps work on all devices at the same time, physically.

Really appreciated if anyone knows of a tool or has an ideas to make this happen cohesively.

Thank you!!