Here is an example of how to create a split screen by putting two videos side-by-side.
Make the elements 50% wide and place them at 25% and 75% on the x-axis. Done!
1{
2 "output_format": "mp4",
3 "duration": 6,
4 "elements": [
5 {
6 "type": "video",
7 "source": "https://creatomate.com/files/assets/752a3508-f215-4ce6-8778-2d1f3d560e68.mp4",
8 "x": "25%",
9 "width": "50%"
10 },
11 {
12 "type": "video",
13 "source": "https://creatomate.com/files/assets/679f6f30-0172-44e5-8d09-ddc712f83b78.mp4",
14 "x": "75%",
15 "width": "50%"
16 }
17 ]
18}