If you are looking for videos on various topics related to NCERT textbooks, there are several platforms available where you can find them. Here are a few options:

1. YouTube: YouTube is a popular platform for educational videos. You can search for specific topics from NCERT textbooks, and you will find a variety of videos explaining those topics.

2. Khan Academy: Khan Academy is a non-profit educational organization that provides free video lessons on a wide range of subjects. They have a dedicated section for NCERT topics, making it a great resource for video-based learning.

3. BYJU'S: BYJU'S is an online learning platform that offers video lessons and interactive content for students. They have a comprehensive collection of videos covering NCERT topics from various subjects.

4. TopperLearning: TopperLearning is an online education platform that provides video lessons, practice tests, and study materials for students. They have a section specifically dedicated to NCERT topics, offering videos on different subjects.

5. Vedantu: Vedantu is an online tutoring platform that offers live classes as well as recorded video lessons. They have a repository of videos covering NCERT topics, which can be accessed by students.

These platforms provide video-based learning resources for various topics from NCERT textbooks. You can explore these platforms and find the videos that suit your needs and preferences.