There are several video lectures and online tutorials available for the civil engineering optional subject. These resources can be extremely helpful in preparing for the civil engineering optional subject of the UPSC exam. Here are some recommended options:

1. NPTEL (National Programme on Technology Enhanced Learning):
- NPTEL is a joint initiative by the Indian Institutes of Technology (IITs) and the Indian Institute of Science (IISc) to provide online courses and study materials.
- They offer a variety of video lectures on civil engineering subjects, including structural analysis, geotechnical engineering, transportation engineering, and more.
- These lectures are delivered by experienced professors and are of high quality, making them a reliable resource for UPSC civil engineering optional preparation.

2. EduRev:
- EduRev is an educational platform that provides video lectures, study materials, and online courses for various subjects, including civil engineering.
- They have a dedicated section for civil engineering optional subjects, where you can find video lectures by experts in the field.
- These lectures cover various topics like hydrology, environmental engineering, construction materials, and more, helping you gain a comprehensive understanding of the subject.

3. Civil Engineering Academy:
- Civil Engineering Academy is a popular online platform that offers video lectures, study materials, and practice questions for civil engineering topics.
- They have a specific section for UPSC civil engineering optional preparation, where you can find video lectures on subjects like structural analysis, transportation engineering, and more.
- These lectures are designed to cover the syllabus of the UPSC exam and provide in-depth explanations of the concepts.

4. UPSC Civil Engineering Optional Online Courses:
- Several online platforms offer comprehensive courses specifically designed for UPSC civil engineering optional subjects.
- These courses usually include video lectures, study materials, mock tests, and doubt-solving sessions.
- Platforms like Unacademy, NeoStencil, and OnlineIAS are well-known for providing such courses, which can be beneficial for UPSC aspirants.

Remember to choose the resources that align with your learning style and preferences. It's also a good idea to supplement video lectures with standard textbooks and practice solving previous years' question papers to strengthen your preparation.