Function create_tracker

examples/main_video.cpp:218–237

}

static void create_tracker(vapp_state& app) {
    if (app.visual_only) {
        // SAM2 / visual-only: use visual tracker (no text detection)
        app.visual_track_params.assoc_iou_threshold = app.track_params.assoc_iou_threshold;
        app.visual_track_params.max_keep_alive      = app.track_params.max_keep_alive;
        app.visual_track_params.recondition_every    = app.track_params.recondition_every;
        app.visual_track_params.fill_hole_area       = app.track_params.fill_hole_area;
        app.tracker = sam3_create_visual_tracker(*app.model, app.visual_track_params);
    } else {
        if (app.init_mode == VMODE_TEXT)
            app.track_params.text_prompt = app.text_prompt;
        else
            app.track_params.text_prompt = "";
        app.tracker = sam3_create_tracker(*app.model, app.track_params);
    }
    app.tracker_created = (app.tracker != nullptr);
    snprintf(app.status, sizeof(app.status), app.tracker_created
             ? "Tracker created. Press Play or add instances."
             : "Failed to create tracker.");
}

static void decode_and_track(vapp_state& app, int fi) {
    app.frame = sam3_decode_video_frame(app.video_path, fi);