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Download jeson file and python file from these links. Open after effects and go to file, scripts, install scripts file and install jeson file. now restart after effects. then open blender and go to edit, preferences, add-ons, install. and install python file. then search import after effects composition and enable it. now installation part is finished. now open after effects and convert video to 24, 30 or 60 fps, otherwise there will be issues with tracking. add video to composition. press control K to open composition setting and change frame rate. now open new project and add 30 fps video footage. make sure frame rate is 30 add 3d camera tracker effect on footage layer. in advance, check detailed analysis, and choose shot type variable zoom. (you can change that according to your video footage). now add camera to the scene. so we have camera in our scene. select tracker points and add null or solids which you want to export. rename solid layers. If solid layers have same names then in blender they all have same location and rotation values. now select all layers which you want to export. then go to file, script, export composition data to jeson dot JSX. enable export selected layers only and choose file location and name and click on export. now open blender and import after effects data. go to file, import, after effecs composition data converted dot jeson. now we have all trackind data in blender. but not proper position. all solids are parented with nulls, it's difficult to work with it. to delete nulls first clear parent. select all solids and null. press alt plus P and clear parent keep transform. now delete all nulls. camera and solids are not parented. so we can't change position. so first parent camera and all solids to any one solid. select camera null and all solids and at last select solid which is going to be parent solid. then click control plus p and select object keep transform. now we cam move our whole setup. select parent solid and go to item and reset location and rotation. and set x rotation minus 90 degree. now select camera and open 30 fps video footage as background. set start frame to zero and end frame according video length. we have key frames for camera and null. Null have location and rotation keyframes and camera have focal length key frames because we selected variable zoom in after effects. key frames set from zero position but we need to set from 1 so select all keyframes and set start position to one. And it's done.