The player in the video find a wild Dragonite near a gym. Since it rarely happens, he try to capture it by all means.
2. Over 2,000 CP!!
The CP of the Dragonite is 2,144 and that is very high. The player will not let it escape.
3. Razz Berry
To put the Dragonite in a good mood and increase capture rate, the player uses Razz Berry.
4. Ultra Ball
He fails to throw Ultra Ball to the Dragonite two times. The ball hits the Pokemon for the third time, but the Dragonite cannot be captured. He uses Razz Berry again ans try to capture it, but the Dragonite is too difficult to catch due to its high CP.
Many players addressed that catch rate is decreased after the resent update. Is that true? This page addresses these catching/escape rate after the resent update. Additionally, it notes 2 other rumors: the association of catch rate and the way to throw Pokeball or trainer level.