+1 on the Seal Mate. I put together a video last year when I had the same problem on my Ducati 848. The SM is easy to use. Some people also use old 35mm film instead (if you have any lying around).
Your leak looks more severe than mine. I eventually replaced both front fork seals for a more permanent fix.
One thing to keep in mind before sending them off to be worked on...
With the forks unloaded (on a stand or removed from the bike) run a fingernail over the surface to feel for imperfections. a little nick can mess up a new seal pretty quickly, then you're back to square one.
Also a SealMate or similar device can be made with plastic file folder tabs, as they are already "edged" like an arrow to take gunk out. Not that it worked for me, my seal was past the point of no return. But if that's all it takes?