Task to put a wound onto a persons face using After Effects. Unfortunately, i didn't do too well with this when trying to make it fit into the scene. It stands out a lot.
Process:
Import your video and photo into After Effects, and then drag the video file onto the new composition button.
with the video selected, go to animation > Track in Boris Fx Mocha
To start tracking a part of the scene, select the pen tool on the top bar and begin to draw around the section you want to place something. Make sure to put the lines on parts that will make the lines know where to hook onto when tracking, like beards, and to put it with space around where you will be tracking to give space and make a better track.
After you draw the selection, and are happy with it, you can use the arrow on the left to track forward/back. This will track the path of the surface you have selected.
Before you close the window, make sure to save the file in the upper left.
with the video selected, look in effect settings and create a new track data. Click next to layer 1 to show the cog and then click ok.
Next create a new null object in the scene, Layer > New > Null object
Click back on the video and change the export layer to the null object you just created and the export option to transform, then apply export.
The null object should now follow the tack when it plays. If it does, hide the null object in the project, it's done it's job showing that the track is working.
Return to the project window and drag the wound png down into the project above the video clip.
Use the selection tool to move it where you need it and use S to scale it down and R to rotate it. If you need to see beneath the image, to see where you are placing it, press T and change the opacity
After done placing it where you want it, restore the opacity and change the parent link to the Null object on the wound png
Next you need mask out the image to just have the wound. This can be done using the pen tool with the image selected. Clicking will create straight lines and click + drag will create curves. When you connect the lines up and complete the mask you will be able to drag the points out and edit them further.
Press this button to hide the mask outline.
Feather the edge of the mask to make the png have less of a sharp edge and blend into the camera plate more.