feat：完善功能

src/components/CoreVideo/index.vue

@@ -14,13 +14,14 @@
           <p class="item-title--primary">
             {{ item.cameraName || item.cameraIndexCode }}
           </p>
+          <div class="item-unfollow">取消关注</div>
           <video
             class="item-img"
             :id="'video' + index"
             muted
             autoplay
             :controls="false"
-            style="object-fit: cover"
+            controlsList="nodownload"
           >
             <source src="" type="application/x-mpegURL" />
           </video>
@@ -145,9 +146,30 @@
       margin-bottom: vh(10);
       padding: vw(10);
       background-size: 100% 100%;
+      &-unfollow {
+        display: none;
+        position: absolute;
+        right: vw(8);
+        top: vw(8);
+        width: vw(64);
+        height: vh(24);
+        text-align: center;
+        line-height: vh(24);
+        font-weight: 400;
+        font-size: vw(12);
+        color: #ffffff;
+        background-image: url('@/assets/images/unfollow.png');
+        background-size: 100% 100%;
+      }
+      &:hover {
+        .item-unfollow {
+          display: block;
+        }
+      }
       & > div {
         position: relative;
       }
+
       &-title {
         position: absolute;
         bottom: 0;