That’s the allegation of “Scenes From The Apocalypse”, a short video purporting to show the results of uncontrolled illegal mass immigration:
Of course anyone can put anything on the Web, however false or misleading. For all I know the footage shows the detritus of a three-day rock concert.
These sorts of camps have been popping up here and there in the poorer areas of for a couple of years. They get removed every now and again. The one on the avenue de Flandre, for example, was removed in August. What I don’t know is how long the powers that be wait before doing so.
IME, from < 2 years ago, lots of Paris “looks like the romantic Cliches in Hollywood movies” so this writer is wrong out of the gate.
What, even the “no-go zones” where the government holds no power and Sharia hordes roam the land with impunity? 
OK, maybe not a Hollywood movie - more like the romantic cliches of aFrench movie.
I live there. Yes, since the spring, there has been migrants/refugees setting up camps in the area. By camp, I mean light tents and mattresses on the pavement. The police “cleans” the area (or part of it) about every three weeks/one month. They’re back (the sames or others, I wouldn’t know) within days, either at the same place or in a nearby street/garden. They “cleaned” the Avenue de Flandres last week, in fact, but there already are new tents there, and many more 200-300 meters away. There’s a canal and and aerial subway around there. At the moment, it’s tent against tent there (along the canal and under the subway), every bit of space occupied. I guess NGOs gave them all tents with the winter coming.
When they displace them, it’s in the range of 1000-1500 people every time. Supposedly, they’re given some kind of lodging, but the fact that they’re back so quickly makes me have doubts. Or maybe they’re unhappy with the place they’re moved to. Or it’s new people coming, I wouldn’t know. Conditions are clearly unsanitary, some NGOs tend to put up toilets (but late and never enough), for instance, or distribute food, but there’s nothing organized at an official level as far as I can notice.
Note that this kind of things have been going on for many years in Paris, with such tent camps installed once here, once there. But it used to be at least in part homeless people, while it’s clearly now overwhelmingly migrants, the “camps” are larger than they used to be, reappear vey quickly, and are always in this same area. I wouldn’t know why, but I would guess the authorities prefer to have them there rather than in a fancier or more touristy district.
ETA : I can’t see the video.
Regardless safety, which is mentioned in the article linked to, there might have been brawls, I wouldn’t know (I know it happens in such situations, in particular between migrants for different countries), but there’s no rampant crime I’m aware of (although there could be, it’s not like I’m kept updated by the police). In fact, there isn’t even begging or such things, which you would expect. I go by the “camps” several times a day, including at night, and don’t notice anything worrying or feel unsafe. I guess some people might feel this way simply by seeing this kind of things, or maybe there’s actually some crime, but I haven’t seen or heard about anything.
It is Zero Hedge, a website that specialises in the outré conspiracy theories and strange propagandas. That is your answer.
and no Paris remains Paris.
But we’ll always have it.
Which, if I read this as intended to be comma-less, brings us to the home port of Theseus.