That timelapse does not show even remotely near a million people. To put a million people into perspective, the entire population of Paris in 2019 was 2.161 million.
The AP article I read on this subject suggested there were around 100K protesters over the entirety of France :
https://apnews.com/article/europe-business-health-government-and-politics-france-d25494f4cf4ca6c6d1464188a89ece6f
Over 100,000 people protested across France on Saturday against the government’s latest measures to push people to get vaccinated and curb rising infections by the delta variant of the coronavirus.
Another article written about past protests in France (it was an old article about protest strikes in France) pointed out how difficult it is to accurately count a protest:
https://www.thelocal.fr/20210127/why-can-france-never-agree-how-many-people-are-protesting-or-on-strike/
RE: What does it mean to be unvaccinated today? Macron makes his intentions clear for France