API Query

[snippsat]

You don't pass datain the request

I guess he forget and have tried that.

It will not work the way you have it now.
Most change header data content-type from the default text/html to text/plain.

import requests

headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:73.0) Gecko/20100101 Firefox/73.0',
    'Accept': '*/*',
    'Accept-Language': 'en-US,en;q=0.5',
    'Content-Type': 'text/plain;charset=UTF-8',
    'Connection': 'keep-alive',
}

data = '{"queries":[{"fields":["title","topic"],"query":"Livestream"},{"fields":["channel"],"query":"ndr"}]}'

response = requests.post('https://mediathekviewweb.de/api/query', headers=headers, data=data)
response_json = response.json()
print(response_json['result']['results'][0]['url_video'])

Output:
http://ndrfs-lh.akamaihd.net/i/ndrfs_nds@430233/master.m3u8