1. What does it mean?
직캠 refers to directly filmed performance footage and is especially associated with videos following one idol member. It lets viewers watch details that the main broadcast's changing camera angles may not show.
Also written or said as 직접 촬영, fancam, jikkaem, jikcam
2. The nuance
Despite the English label 'fancam,' a 직캠 may be filmed and released by a broadcaster rather than a fan. A face-focused clip and a full-body performance clip also show different things. The word is not a promise that footage is unedited.
3. Examples
“안무의 발동작이 궁금해서 전신 직캠을 찾아봤어.”
I wanted to see the footwork, so I looked for a full-body fancam.
“방송사에서 올린 직캠으로 그 무대를 다시 봤어.”
I watched the performance again through the broadcaster's fancam.
Sources
KASIODA: Korean language and K-pop guide
References support the meaning and usage. Example sentences are written for NoCapWiki.