Possible inspirations: The film "Lord of the Flies" for themes of conflict and survival, though that's more about adolescents. "Koyaanisqatsi" for its exploration of time and human-environment interaction through visual art. Or "The Sandbox" play by Edward Albee, though that's a play about death and mortality.
If it's an interactive installation, viewers could influence the video's progression by adding sand or making choices in the sandbox, affecting the kids' actions. The content might adapt based on user input, making each viewing unique.
In summary, the content of "two kids one sandbox original video install" would likely involve two children interacting in a sandbox setting, using the sandbox as a metaphor for broader themes. The installation would be designed to engage viewers through visual storytelling, possibly with interactive elements, and would explore themes related to childhood, conflict, cooperation, and human interaction with space.