There are several video lectures and online courses available for history optional preparation. These resources can be incredibly helpful in providing comprehensive and structured guidance to aspirants preparing for the UPSC exams. Here are some details about these resources:

1. Unacademy: Unacademy is a popular online learning platform that offers a wide range of courses, including history optional. They have a team of experienced educators who provide video lectures, study materials, and practice questions to help students prepare effectively.

2. Khan Academy: Khan Academy is a well-known educational website that provides free video lectures on various subjects, including history. While they do not offer a specific course for history optional, their lectures can be a valuable resource for understanding key concepts and topics.

3. EduRev: EduRev is an online learning platform that offers a dedicated course for history optional preparation. This course includes video lectures, study notes, quizzes, and practice questions to help students gain a strong understanding of the subject. It is a comprehensive and reliable resource for UPSC aspirants.

4. YouTube Channels: There are several YouTube channels that provide video lectures on history optional. Some popular channels include Mrunal Patel, Study IQ Education, and Pradip Kumar Sarkar. These channels offer a wide range of videos covering various topics in history, making it easier for students to access quality content.

5. Online Coaching Institutes: Many coaching institutes offer online courses specifically designed for history optional. These courses provide a structured approach to the subject, covering all the relevant topics in detail. Some well-known coaching institutes for history optional include Vajiram and Ravi, Chanakya IAS Academy, and Drishti IAS.

In conclusion, there are numerous video lectures and online courses available for history optional preparation. These resources provide comprehensive coverage of the subject, enabling UPSC aspirants to effectively prepare for the exams. It is advisable to explore multiple platforms and choose the one that suits individual learning preferences and requirements.