diff --git a/src/api/media_api.rs b/src/api/media_api.rs
index 247a812..9d30dba 100644
--- a/src/api/media_api.rs
+++ b/src/api/media_api.rs
@@ -323,10 +323,10 @@ async fn trace_video(
     let start_fn = (start_sec * fps) as i32;
     let end_fn = (start_sec + duration) as i32;
 
-    // Query all traces with identity names in the visible frame range
+    // Query all traces with identity names and bbox positions in the visible frame range
     let identities_table = schema::table_name("identities");
-    let all_rows: Vec<(i32, i32, Option<String>)> = sqlx::query_as(&format!(
-        "SELECT fd.trace_id, fd.frame_number, i.name \
+    let all_rows: Vec<(i32, i32, i32, i32, i32, i32, Option<String>)> = sqlx::query_as(&format!(
+        "SELECT fd.trace_id, fd.frame_number, fd.x, fd.y, fd.width, fd.height, i.name \
          FROM {} fd \
          LEFT JOIN {} i ON fd.identity_id = i.id \
          WHERE fd.file_uuid = $1 AND fd.frame_number BETWEEN $2 AND $3 AND fd.trace_id IS NOT NULL \
@@ -337,12 +337,14 @@ async fn trace_video(
     .fetch_all(state.db.pool()).await
     .unwrap_or_default();
 
-    // Group frames by trace_id, compute start_frame per trace
+    // Group frames by trace_id, compute start_frame per trace; collect bbox per frame
     use std::collections::HashMap;
     let mut trace_frames: HashMap<i32, Vec<i32>> = HashMap::new();
     let mut trace_identity: HashMap<i32, String> = HashMap::new();
-    for (tid, fn_, name_opt) in &all_rows {
+    let mut bbox_per_frame: HashMap<(i32, i32), (i32, i32, i32, i32)> = HashMap::new(); // (tid, fn) -> (x, y, w, h)
+    for (tid, fn_, x, y, w, h, name_opt) in &all_rows {
         trace_frames.entry(*tid).or_default().push(*fn_);
+        bbox_per_frame.insert((*tid, *fn_), (*x, *y, *w, *h));
         if let Some(name) = name_opt {
             trace_identity.entry(*tid).or_insert_with(|| name.clone());
         } else {
@@ -400,6 +402,23 @@ async fn trace_video(
         y_pos += 22;
     }
 
+    // Green thin bounding boxes with trace_id label for each face detection
+    for (tid, frames) in &sorted_traces {
+        for fn_ in frames.iter() {
+            if let Some((x, y, w, h)) = bbox_per_frame.get(&(*tid, *fn_)) {
+                let n = *fn_ as i64 - frame_offset;
+                parts.push(format!(
+                    "drawbox=x={}:y={}:w={}:h={}:color=green@0.7:thickness=2:enable='between(n,{},{})'",
+                    x, y, w, h, n, n
+                ));
+                parts.push(format!(
+                    "drawtext=text='{}':x={}:y={}:fontsize=16:fontcolor=green:box=1:boxcolor=black@0.5:enable='between(n,{},{})'",
+                    tid, x + 2, y + 2, n, n
+                ));
+            }
+        }
+    }
+
     let filter_text = parts.join(",");
     let filter_file = std::env::temp_dir().join(format!("vf_{}.txt", uuid::Uuid::new_v4()));
     let _ = std::fs::write(&filter_file, &filter_text);