Vin Diesel's moving tribute to Paul Walker

Action star Vin Diesel has given a rare glimpse into his private relationship with his late friend and Fast and Furious co-star Paul Walker.

The action star has posted a 18-minute video, which was uploaded to Facebook, made up of behind-the-scenes footage of the pair collected over the years.

Titled "A glimpse… of Don and Brian… off screen", the short film shows the camaraderie between the two actors go about the promotion circuit for the franchise.

Read More: Paul Walker's autopsy results.

The touching film captures in-jokes between the pair as they laugh and kid behind the camera and reminisce about the 'gold old times'.

It has been reported that Walker's character Brian O'Conner will be retired from the franchise.

Universal Pictures has pushed back the release of the seventh film in the series to allow time for script changes since Walker's untimely death.

Walker and his friend Roger Rodas were killed in a car accident in November.