Apparently this has been going on for some years every Friday between 3 and 5pm. There are some more videos at the French blog Bivouac ID. The places where the videos are taken seem to be mainly up in the 18th Arrondissement not far from Montmartre.
In France, this islamisation is opposed strongly by the proponents of laicité, those who work against any influence of religion in the public square and have been vocal in opposition to the influence of Islam. This is an interesting contrast with England where the secularists seem to focus their energies much more on attacking the Catholic Church.
Last year, I wrote about how the SSPX were prevented from ending their Pilgrimage from Chartres as they had often done before, in front of the Basilica of Sacré Coeur. Rorate Caeli carried the letter of Fr L Duverger in response. The authorities seem disinclined to to anything about the Muslims occupying streets not far away.