i'm also going to vote something with the brakes.
if those are the OEM pads, that's not how the rotor surface should look.
if it's possible, do a full bed-in and see if that helps.
just dont come to a complete stop during or after the procedure. instead, head for the motorway and drive for 5-10mins to cool down the brakes.
You will need to predict the lights and brake very gradually to avoid coming to a stop. if you must stop, use the handbrake to hold the car.
secondly, if i roll (forwards or backwards) and yank the handbrake up, it will make that sound in the video.
thirdly, OEM pads shouldnt vibrate or groan when you let go of the pedal slightly. they release quite smoothly and without noise.
to me, it looks like some material on the rotor surface that is affecting the performance of the brakes. similar to when you wash your car and hose the wheels, create brown rusty deposits on the rotors and back your car out. the brakes are super sensitive for the first couple of light applications, then return to normal.
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