There's usually an amulet on the ground at the very start of the first cave you enter, I don't think Ive ever seen a quest marker though, you need to pick it up then find it in your inventory and examine it?

Unless it is actually bugged in which case these instructions won't help! Haven't done the quest recently.

I did this quest about a month and half ago (xbox),and it was fine, but anything can and will break in this game, if you're on pc perhaps try without add-ons? bearing that then it's probably glitched as you say

tomofhyrule wrote: »

There's no marker.

Find a corpse and it should have the amulet. Then go into the inventory and 'Use' the amulet. I forget if it's in Misc. Items or in Quest Items, but it should be useable and that'll continue the quest.

many corpse are there in the cave and I clicked all...and nothing happend! And on the location from the video is no corpse.

If you check the video, you can see that a marker is on the corpse and start automatically.

And I have no amulet in my inventory.

So the only thing what is possible...it's bugged...