Those guys don't work directly for Le Pen but for the Event organization. They might have been instructed by french police to throw the reporter and his camera guy out.

After they were thrown out, a security guard said they were harassing police officers. The reporter shouted he has a press card and that he has all the right to be there and tried to enter again.

Security pushed the reporter out again and at that moment the camera grabbed or punched the security guard in the arm to which you see him slapping the camera.

When the lady tried to diffuse the situation, the camera guy called the security guard 'fils de lache' which literally translates to 'son of coward' to which she responded ' what did you say? whats your deal?' which escalated the situation even more.

The security guards basically repeated 'who do you think you are' and 'I swear you're not entering'

Here is another POV http://www.lalibre.be/light/buzz-tele/voici-la-question-qu-a-posee-le-journaliste-de-quotidien-a-marine-le-pen-avant-d-etre-agresse-et-menace-5892d16ccd70e747fb7851bc