[mirotalksfu] - add toggle video privacy

public/css/VideoGrid.css

@@ -150,6 +150,26 @@
     margin-right: auto;
 }
 
+.videoCircle {
+    position: absolute;
+    width: var(--vmi-wh);
+    height: var(--vmi-wh);
+    border-radius: 50%;
+    /* center */
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    margin: auto;
+}
+
+.videoDefault {
+    position: absolute;
+    width: 100%;
+    height: 100%;
+    border-radius: '10px';
+}
+
 video {
     width: 100%;
     height: 100%;