Divide the deck of 52 cards into two stacks of 26 cards.
Ask the participant to choose a pile and pick a card.
Ask the participant to place his/her card on top a a pile.

Remember :
If partcicpant places his/her card on top of the right pile, his/her card will be card 27 or in pile 3.
If partcicpant places his/her card on top of the left pile, his/her card will be card 26 or in pile 2.
Place the other pile on top of his/her card.

In the video, the card is placed on the left pile.
Therefore the participant's card will be the 26th card or in pile 2.

Deal the top 4 cards face-down onto the table making four stacks.
Deal all  the cards onto the 4 stacks.

Ask the participant to point to any 2 stacks.
1  2  3  4
If participant points to stack 2 remove any other two stacks.
(In the video the magic wand is pointing to stack 2.)

Ask participant to point to 1 stack.
Pick up a stack.

Deal out 4 stacks face-down onto the table.
The first stack will end up having an extra card.
Set the first stack aside.

There are now 3 stacks. 

Place the third stack on top of the first stack
Place the second stack on top of the other two. 

Make 2 stacks face-down on the table.
The first stack will end up having an extra card.
Set the first stack aside.

You  now have one stack of 4 cards.

Place the cards down on the table, one beside the other.
The participant's card is the bottom card on the stack
(The magic wand indicates the card.)

Ask the participant to point to any 2 cards.
1  2  3  4
Remove the other two cards

Always be sure to keep card 1 on the table
(In the video the magic wand is ponting to card 1)

Ask participant to point to a card.
Remove a card.

Ask the participant to tell you his/her chosen card.
Turn over the card.

Magic!