The Trainspotting author - from Edinburgh - was a close friend of Bradley, who was shot and killed outside his address in the West End of Edinburgh on Wednesday evening.
Bradley (48) also appeared as Mr Doyle in Trainspotting sequel Trainspotting 2.
The video shows three men working on the spray-paint murals on the Bridge of Doom near Hibs' Easter Road stadium, while another man, believed to be Irvine, holds the camera.
Bradley was known to be a life-long Hibs fan along with friend Irvine.
Another mural has also appeared on a fence towards the rear of the East Stand at Easter Road.
Irvine had earlier paid tribute to Bradley on his Twitter account, saying: "Bradley John Welsh, my heart is broken. Goodbye my amazing and beautiful friend. Thanks for making me a better person and helping me to see the world in a kinder and wiser way."