That is unfortunate. A 74HCT14 at the ESP8266, powered by 5 V with a 0.1 µF bypass capacitor from 5 V to ground. The 74HCT14 is a hex inverter, so you feed one inverter with your data and its output into a second inverter which gives you the original data at a 5 V level.
You either connect the inputs of the unused inverters to ground, or connect the other four in parallel with the second to give increased current drive. If you do the latter, it may be preferable to use a 74HCT04.
You then send this data in a cable paired with the ground to the LED strip where you have the 330 Ohm resistor in series with the data to the "Data In" of the first pixel.
Slight misnomer - a "termination resistor" suggests it is in parallel - in this case it is in series.