def convert_nested_tuple(my_list):
   for elem in my_list:
      if isinstance(elem, list):
         convert_nested_tuple(elem)
      else:
         my_result.append(elem)
   return my_result

my_list = [[[(3, 62)]], [[[(57, 49)]]], [[[[(12, 99)]]]]]

print("The list is :")
print(my_list)

my_result = []
my_result = convert_nested_tuple(my_list)

print("The list is :")
print(my_result)

The list is :
[[[(3, 62)]], [[[(57, 49)]]], [[[[(12, 99)]]]]]
The list is :
[(3, 62), (57, 49), (12, 99)]