Fascinating footwell video of a V8 Supercar lap. The car has an ignition cutout on the upshift so the foot stays flat on the accelerator during the gear change. The heel and toe (clutch in and engine blip) is something you will not see in pretty much any racing series now, but they wanted it to stay in Supercars.
Since pioneered in the 1989 Ferrari this is usually done by computer now; the transmission forks and throttle are moved by an actuator, the whole thing is coordinated by a computer. The driver changes gear via paddles behind the steering wheel.
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There's a thing at Ferrari's site about it here: https://www.ferrari.com/en-EN/magazine/articles/great-ferrari-innovations-the-f1-semi-automatic-gearbox
