Search XYZ: and write in a paper the Coordinate for remember it. Now write the Coordinate in the 1st command, after be copyed /tp @p.

Now place another Command Block and Copy the 2nd command. (To have the Command Block, write in Chat: /give @p minecraft:command_block)

Now place another Command Block and Copy the 3rd command.

So, now you have Surveillance Camera. Delete the 3rd command, 3rd Command Block too.

Now you have to place a Ripetitor between the 1st and 2nd Command Blocks, and a Button up the 1st Command Block.

Now go to your Home, in a ANGLE, place a Block in the roof BUT you have to leave one block to space. up the block that you have place, put the Camea.

Delete the Block. Now, get a Lever and place it UNDER the Camera.

Now you have to get a Barrier, in front of one of the Lever. (To have Barrier, write in Chat: /give @p minecraft:barrier)

Done! Now you can see your House in a Camera. Looks like Cool. See ya! :D