SpaceX GPS III SV04 Launch

G Block III SV04: The fourth Third Generation Global Positioning System (G) satellite, named Sacagawea

Watch the right edge of the screen. This is just after stage separation and you're seeing the second stage. At 3:10 watch the bottom middle where you'll see the first stage's re-entry burn.

The bright object in the center of the screen is Mars.

Bonus: Several satellites can be seen (no, not the several planes), and, if you know astronomy enough, you can find the Andromeda Galaxy in this shot (hint: Top left. Fuzzy looking 'star')