Data ingestion using kafka from crawlers
without any middle scripts/service file . Is it possible ?

Unfortunately, no. 
You need some service that's writing into Kafka (your scraper). Whether you produce into Kafka HTTP links (then write an intermediate consumer/producer that generates the scraped results), or only produce the final scraped results, that's up to you. 
You also need a second service consuming those topic(s) that writes to HDFS. This could be Kafka Connect (via Confluent's HDFS Connector library), or PySpark (code you'd have to write yourself), or other options that include "middle scripts/services".
If you'd like to combine both options, I would suggest taking a look at Apache Nifi or Streamsets, which can perform HTTP lookups, (X)HTML parsing, and Kafka+HDFS connectors, all configured via a centralized GUI. Note: I believe any Python code would have to be rewritten in a JVM language to support major custom parsing logic in this pipeline
I am trying to work with Kafka for data ingestion but being new to this, i am kind of pretty much confused.I have multiple  crawlers, who extract data for me from web platform. Now, the issue is i want to ingest that extract data to Hadoop using Kafka without any middle scripts/service file . Is it possible ?