Shane Mayer was set upon by four hooded young men in Darlaston, Walsall, with Ramani Sanderson accused of stabbing him in his leg.
Jurors at Birmingham Crown Court were shown segments of CCTV from Forge Street on the night of July 24, 2019.
The attack, outside Gabba’s Bar, was between 11.13pm and 11.14pm.
Mr Mayer, from Wolverhampton, collapsed in a nearby road and died in hospital three days later.
Sanderson was described as “profile one” on the footage.
He allegedly attacked Mr Mayer with a knife, measuring between 30 and 40 centimetres.
Also in the footage was Reid, profile two, Mr Mayer, profile seven, and the victim’s friend, profile six.
Prosecutor Michael Burrows QC said: “Profile one, Ramani Sanderson, there is a box [on the footage] around a large, straight item coming from the straight of his back.
"Profile six and seven appear to be in front of profile one. Seven has his hands together out front.
“Profile one, the dark figure, begins to lunge towards profile seven and profile seven moves to his side, with his right foot going backwards.”
Detective sergeant Andrew McDonald, who was also commentating on the footage, said: “Profile one appears to lunge forward at profile seven. Profile one appears to connect with profile seven’s left side and back.”
Paramedics found Mr Mayer with three stab wounds to his groin after a member of public phoned an ambulance for him.
The injuries ruptured his femoral artery. His cause of death was given due to those injuries. Mr Mayer lost consciousness after the attack and never woke up. He also needed part of his leg amputating in hospital.
Ramani Sanderson, 20, of Walsham Road, near Peckham, London; Kamron Reid, 20, of of Herberts Park Road, Bloxwich; Joseph Till, 21, of Summer Street, Willenhall; and Lewis Green, 21, of of Heathfield Lane West, Darlaston, all deny murder.
Sanderson also denies possessing a bladed article in a public place. Green has admitted carrying a hammer.
Sanderson is also standing trial accused of assaulting a taxi driver in a separate incident on April 29, 2019.
He is charged with wounding with intent, and possession of a bladed article in a public place. He denies both charges as well.
The trial continues.