Victory Day, also known as V-J Day, marks the victory of the Allies over Japan during World War II, effectively ending the war in 1945. For high-definition (HD) video content related to Victory Day in the USA, you may want to explore official archives such as the National Archives and Records Administration (NARA), or reputable online platforms like the History Channel's website, which often feature HD clips and documentaries about historical events.

For specific video resources, consider searching for terms like "V-J Day HD" or "Victory Over Japan Day 1945 HD" on YouTube or Vimeo, where users and educational institutions upload high-quality historical footage. Additionally, local libraries or historical societies in areas with significant WWII history might offer access to high-definition materials or provide guidance on accessing them.

Remember that while seeking high-definition content, it's crucial to ensure the authenticity and copyright status of the material to respect intellectual property rights.