Taking images from the camera in Thread(worker)

I can access the document object with javascript codes in **em_asm** without a thread, but I cannot access it when I open a thread (i.e. **worker**).
In this [link](https://web.dev/articles/workers-basics#toc-enviornment-features), it says that I cannot access the "**window, document, parent**" objects.

What I want to do is to open an infinite loop in the thread and use setInterval?
The video element is taking images from the camera.
Is there an alternative solution?
How can I get an image from the camera in a thread?

CMakeLists.txt:

```
cmake_minimum_required(VERSION 3.22)
project(emscripten_global_variable_test)
set(CMAKE_CXX_STANDARD 17)
add_executable(emscripten_global_variable_test main.cpp)
set_target_properties(${PROJECT_NAME} PROPERTIES LINK_FLAGS "--bind -sUSE_PTHREADS -sPTHREAD_POOL_SIZE=5 -s TOTAL_MEMORY=256MB -s ALLOW_TABLE_GROWTH=1 -s NO_EXIT_RUNTIME=1 -s ALLOW_MEMORY_GROWTH=1 -O0 -s EXPORT_ALL=1 -s EXTRA_EXPORTED_RUNTIME_METHODS=['ccall','cwrap']")

```

main.cpp:

```
#include
#include "emscripten.h"
#include "emscripten/val.h"
#include "thread"

extern "C" EMSCRIPTEN_KEEPALIVE void Test(){
// directly document not working!
auto k= emscripten::val::global("document");
std::thread([&k](){
EM_ASM({
var video= Module.emval_get_global().document.createElement("video");
video.setAttribute("id", "videoInput");
Module.emval_get_global().document.body.appendChild(video);
});

EM_ASM({
console.log(Module.emval_get_global().document.querySelector("#videoInput"));
});

}).detach();
std::cout<<"Test"<