A brave Brooklyn delivery driver caught on video slogging through deadly flood waters may have some extra cash coming to him — if the guy who filmed the clip can find him.

The footage of the unknown man nearly losing his bike beneath the waist-deep deluge has been seen nearly 12 million times.

The mysterious cyclist, if found, has a cool $1,700 coming his way – money Johnny Miller said he’s earned capturing the moment on his cell phone.

Miller, who moved from Seattle just three weeks ago, was leaving a Williamsburg gym around 10 p.m. Wednesday only to find the intersection of North 11th and Roebling streets engulfed by frightening floodwaters from the remnants of Hurricane Ida.

“I’ve never been through a hurricane before, never seen a flood like that before,” Miller, 40, told The Post. “We don’t get severe weather like that in Seattle.”

Trash bags were floating in the nearly waist-high water, while cars appear immobilized, the footage shows. Amid the historic calamity is the driver, bulging plastic bag in left hand, struggling to push his bicycle through the deluge.

 “I have a water-proof phone so I pulled it out and started shooting immediately,” Miller said Friday, as he walked the streets of Williamsburg putting up posters and searching for the man in the video. “I sent it out (on Twitter) and it went viral right away.”

Miller tagged Grubhub in the Tweet, but admits he’s not sure the man works for that service.

Rep. Alexandria Ocasio-Cortez (D-NY) shared the video to her 12.7 million followers in a bid to help find the man, who wears a mask, hood and black jacket with reflective tape across the shoulders, making it hard to identify him.

Miller, a professional photographer committed to social justice causes, hopes to find the driver and give him the dough.       

“It’s sort of a small gesture toward addressing the inequality we face in society,” said Miller. “I thought it might be the right thing to do and maybe get people interested in our cause.”