It started out as a bit of fun on Youtube - now two Norfolk teenagers have their eyes on stardom after leaping off ledges, clambering car park walls and propelling themselves from a pier.

Ryan Lovejoy, 19, and Marcus Wilson, 17, turned their love of stunts and filming into a four-minute video showcasing Marcus performing a discipline called parkour which involves jumping, somersaulting and climbing around buildings.

Since uploading the video on Youtube two weeks ago, Marcus has won sponsorship from America, while Ryan has secured a place on a competitive film course in London.

Marcus took up parkour with friends four years ago. Starting with flips at the gym in Beccles Sports Centre, he moved on to climbing buildings and swinging off scaffolding with a Spider Man-like ease.

'You just train and train,' he said. 'The danger depends on how experienced you are.

'You have to train safely but my parents have got used to it. They just like me to be careful.'

Marcus broke his arm two years ago but returned to training while still in plaster.

For the video, shot in Norwich as well as Great Yarmouth, Lowestoft and Beccles, he clambers across the roof of Chapelfield Shopping Centre, while spinning off Yarmouth's pier.

Ryan, who had to follow Marcus up buildings with his camera gear to film the video, said: 'You have to have that vision of what would look good on film.'

But the boys have been surprised by the success of the video which took nearly a year to complete.

The day it was posted online Marcus was contacted by the World Freerunning and Parkour Federation (WFPF) based in Los Angeles who have given him sponsorship. He has to wait until he turns 18 before he can perform for them but hopes to become a professional stuntman.

Ryan, who is studying media production at City College Norwich, said: 'I've learned so much through doing the video as an editor and camera operator. I just want to build up more and more work.'

And the boys, who met at Sir John Leman High School in Beccles, have already earned their first commission from the film - a trip around the country to shoot a promotional video for the Student Pocket Guide.

They now plan to travel the UK and film Marcus' stunts at famous sites in university towns and cities.