MediaRecorder mediaRecorder = new MediaRecorder();

CamcorderProfile profile = CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH);
profile.videoFrameWidth = 1280;
profile.videoFrameHeight = 720;

mediaRecorder.setCamera(Camera.open());
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
mediaRecorder.setProfile(profile);
mediaRecorder.setOutputFile("/path/to/video.mp4");

mediaRecorder.prepare();
mediaRecorder.start();