Circuit Part : The circuit design is totally simple since we have only three wires in NEOPIXEL 5V ,Gnd & Din wire so we have to connect the 5V wire of NEOPIXEL to the Vin pin on nodemcu (since we are using Vin pin as 5V pin for NEOPIXEL so you cannot connect more than 5v as a input supply to nodemcu so make sure you are powering with usb cable otherwise you'll destroy your neopixel so be careful ,make sure input supply is 5v) then connect Gnd of neopixel to Gnd of nodemcu & then connect the Din pin of nodemcu to any digital pin of nodemcu as you can see in the picture i have connected it to pin "D2".

Blynk App setup : Download & open the BLYNK app then create a new project and select Board as nodemcu then it'll sent a auth token to your email id (keep the auth for code) then from widget list pic zebra widget and then click on it then in zebra app click on "merge" and select virtual pin "v2", refer attached image for help.

Coding part: Download the code then Open the code and set the no of LEDs as i set 30 for mine set the Din pin of neopixel as mine is D2 and set the Virtual pin you used in blynk app as i set as V2 and in the Blynk.begin function set as

Blynk.begin(auth token, ssid , password);

In this function enter your auth token sent to your email id and put ssid & password of the network.then upload the code to nodemcu.

Final Step : so connect the power cable and run the app and click anywhere on zebra and you'll see that led strip will glow in the color you clicked on the app so you can change the color whatever you want over the internet so make your own , have fun.