Overall world population growth is going up due to large population increases in South America, Asia and Africa. In European, USA and Japan the indigenous population is declining, which is what the video is about.

This is the reverse of the last 200 years when there was mass migration to North America, Africa, Australia and New Zealand, from a large growth in Europe's population due to the Industrial Revolution and escaping famines, like those in the 1840's and 1850's in Ireland. Our great grandparents typically had about 10 children, if they hadn't most of us wouldn't be here.

What this means is that we all have to breed more or accept mass migration to here from the counties of large population growth. The alternative is to accept a decline in population and standards of living due to an ageing population.
In many East European countries their populations are declining, due to it being better to migrate to richer western European countries as economic migrants and a very low reproduction rate of about 1.2 - 1.3 children per couple. The population decline is especially bad in Russia and Ukraine, about 0.5% a year, that they now pay large sums of money to the the parents when a child is born, but the decline continues.