CSS 라이브 데모: object-position 데모 버튼을 클릭해 보세요!
selector {
    object-position: /*position value */;
}
/* 키워드 값 */
object-position: top;
object-position: bottom;
object-position: left;
object-position: right;
object-position: center;
object-position: center top;

/* 백분율(%) 단위 값 */
object-position: 45% 55%;

/* 길이 값 */
object-position: 0 0;
object-position: 1cm 2cm;
object-position: 13ch 6em;

/* 모서리 오프셋 값 */
object-position: top 0 right 10px;
object-position: bottom 12px right 20px;
object-position: right 3rem bottom 10px;

/* 전역 값 */
object-position: inherit;
object-position: initial;
object-position: unset;
object-position: revert;
object-position: revert-layer;
<div class="container">
    <img src="earth.jpg" alt="우주에서 둥글고 푸른빛으로 빛나는 지구">    
</div>
.container {
    width: 260px;
    height: 250px;
    border: 5px dashed red;
}
img {
    width: 100%;
    height: 100%;
    object-fit: none;
    object-position: left bottom;
}
실제 적용 모습
<div class="container">
    <video src="flower.webm" autoplay muted playsinline loop></video>
</div>
.container {
    width: 260px;
    height: 250px;
    border: 5px dashed red;
}
video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center center;
}
실제 적용된 모습